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Main Characters
Cat
Voiced by: Jim Cummings
The former of the title brothers. Cat is the smarter and more sophisticated of the pair, often coming up with hare-brained get-rich-quick schemes and being literally dragged around by his dimwit brother.
- Abhorrent Admirer: He is occasionally portrayed being attracted to Shriek, who, like the other Greasers, despises cats.
- A Head at Each End: Like Dog, his head is at one end of their body.
- Ax-Crazy: In "Monster Truck Folly" he ends up snapping and attacking everyone unprovoked.
- Beware the Silly Ones: While not particularly silly, Cat is humorous through his constant misfortune, snark, and snobbishness. As "Monster Truck Folly" shows, when he gets pushed too far, he goes into an Unstoppable Rage,
- Big Brother Bully: Depending on the Writer, he may be one to Dog by abusing him, yelling at him, or manipulating him for his own personal gain.
- Big Brother Instinct: Even though he's only a few minutes older than Dog, he's protective of him and tries to keep him out of trouble.
- Born Unlucky: He is often the one of the pair who ends up with the worst luck and is more often than not on the receiving end of the short end of the stick. Granted, he does bring half of it on himself, but even when he does nothing wrong, he still has bad things happen to him.
- Butt-Monkey: Attracts a lot of pain, sometimes due to Dog's carelessness.
- Cats Are Mean: Sometimes. On occasion, he's downright cruel.
- Cats Are Snarkers: And how! He gets it from his dad.
- Character Catchphrase:
- "Bee-yoo-tee-ful!"
- "It just doesn't get any better than this!"
- "Terr-riffic" (sarcastically)
- "MY BODY MY BODY MY BODYYYYAAAGH!!!"
- A deep-voiced "Ohhh MOMMA" when he's feeling greedy.
- The Chew Toy: Poor guy can't seem to catch a break.
- Cloudcuckoolander's Minder: He's usually the voice of reason to Dog.
- Deadpan Snarker: Especially towards Dog's idiocy.
- A Dog Named "Dog": Just like Dog, he's a cat named Cat.
- The Dog Bites Back: The second half of "Monster Truck Rally" has him beating the crap out of everyone who has ever crossed him over the course of the series after being pushed to his Rage Breaking Point.
- Greed: His obsession with money and material possession can go a little too far sometimes.
- Happily Adopted: The big movie about finding their long lost parents, they find out in the end that the parents that raised them as kids had adopted them. And were also a talking frog and a sasquatch. They never find out who their biological parents are, but are content to reunite with the ones that cared for them.
- Heavy Sleeper: In "War of the CatDog", Dog tries to make sure Cat is asleep, so he tries calling his name, poking him, and even putting his hand in Cat's mouth. Cat sleeps through all this.
- Jerkass Has a Point: His frustration with Dog's antics is actually pretty understandable given how much trouble his brother tends to drag him into.
- "The Great Parent Mystery" has Cat almost coldly telling Dog that his theories about their parents are wrong and that the only reason for their absence is that they aren't looking for him and Dog. It was very harsh but they've lived almost their entire lives without their parents and Dog's theories have zero basis in fact or evidence of any kind. Can't blame him for thinking the worst.
- Jerk with a Heart of Gold: He can be mean at times, but he does care about his brother.
- Karmic Butt-Monkey: About half of his suffering is due to a result of him catching a good dose of karma whenever his selfishness and greed comes back to bite him.
- Laser-Guided Karma: Episodes where he acts selfish often end with him getting his comeuppance. For instance, "Fred the Flying Fish" has him lose the money he got from selling Fred to Rancid Rabbit with no regard for how Fred would be treated.
- Like Father, Like Son: His adoptive father is also a snarker.
- Mr. Vice Guy: He can be greedy, and cross the line into villainy, but most of the time he is the hero.
- The Matchmaker: The most prevalent example being in "Shriek Loves Dog," where we get a visual of him shooting a Cupid's Arrow when Dog falls in love. He's tried to hook other characters up with people too, particularly Winslow and Lube.
- Narcissist: To the point that one episode implies that he spells his name in all capital letters.
- Neat Freak: In contrast to Dog.
- No-Respect Guy: He isn't very well liked in his town.
- Nostalgia Filter: Deconstruction. In the episode "Back to School", Cat is looking forward to attending his high school reunion and dancing with his old crush Sally. He describes himself as popular and having a great time in high school. Even in the beginning of the episode something is fishy, with all of the memorabilia and rewards he claimed were his really belonging to Dog, and their diploma having Dog's name but not Cat's. He tells Dog that they need to correct it by visiting their old high school. The brothers visit Rancid the school principal about the diploma, and it is revealed Cat never attended the last day of school so for him to have the diploma and be able to attend the reunion dance, he must go back to school for one day. Cat is happy to relive his glory days, but wonders why he can't remember his last day at school. But throughout the day things just keep going wrong with him while Dog is popular - three of Cat's new classmates are the relatives of the Greasers who make him miserable, his crush Sally is indifferent to him, and after class when he asks her to dance with him at the reunion, she coldly tells him that she has a boyfriend and makes it clear that she does not like him. At lunch both the cool kids and nerds refuse to let Cat sit with them, and then a food fight break out and Cat gets blamed for it. Finally at gym he is humiliated by Cliff, who is the teacher and Sally's boyfriend, who brings Sally there to watch his humiliation. As the kids laugh at Cat and call him a loser, his repressed memories come back and he realize the truth - Cat was an outcast and all of his positive memories of school were Dog's, and at the last day of school he was humiliated at gym by Cliff's father Coach Feltbottom, the gym teacher at the time, where he and all the other kids call him a loser, which made Cat run away and block out his memory of the day. And because Cat blocked out his memory of that day and chose to remember things differently, he set himself up for more humiliation in this episode.
- Not So Above It All: Arguably a Deconstruction, considering what he (and sometimes Dog) will go through on a daily basis. In slew of being in a town where he's beaten and treated like an outcast, it doesn't hurt to get a little petty revenge now and again when he gets the chance.
- Generally speaking, for someone who claims to be sophisticated, he won't pass up a chance to do something to satisfy his selfish curiosity, usually at the expense of Dog's trust.
- Also, for all the times he's complained about Dog and his incessant need of being a "dog", he has given in to his instinctive urges towards being a "cat" sometimes; notably developing a sudden taste for mice (Chasing Winslow), and at one point, eating Dog's pet fish, "Veronica".
- Only Known by Their Nickname: In "Smarter Than the Average Cat", we find out that his real name is Felinius and Cat is just a nickname.
- Only Sane Man: He's usually this to Dog.
- Rage Breaking Point: After all the abuse he takes throughout the series, when he gets stuck in a monster truck arena where anything goes and is repeatedly harassed and subject to even more taunts and Amusing Injuries than usual, Cat snaps and goes into an Unstoppable Rage in which he beats the crap out of everyone who has ever screwed him over, culminating in him destroying the Greasers’ truck in one punch.
- Red Eyes, Take Warning: Cat sports these at the start of his Rage Breaking Point in "Monster Truck Folly".
- Small Name, Big Ego: Cat quite often has an inflated opinion of himself.
- Surrounded by Idiots: He's even attached to one!
- Throw the Dog a Bone: Or, in his case, Throw the Cat a Fish. Cat has his moments where he comes up on top at the end, such as "Kookie Prank Day" where he got back at everyone who pranked him.
- Trademark Favorite Food: White fish chub. And fish in general. Perhaps best illustrated when he and Dog go to Rancid's all you can eat buffet and Cat expresses irritation at Dog's Crazy Consumption...until Rancid brings out a tray of sushi and Cat proceeds to go ballistic.Cat: Fishy...fishy...FISH!!!!! (scarfs down as much sushi as he can)
- Tsundere: He's usually shown to be very selfish and obsessed entirely with money, but whenever Dog has been utterly humiliated, he'll stop at nothing to make him happy again.
- Unstoppable Rage: In “Monster Truck Folly”.
- Why Did It Have to Be Snakes?: He has aquaphobia which makes him afraid of water. This is best shown when he's at the beach and the others challenge him to ride a big wave, in which he claims he only likes the big waves that are at least thirty feet high.
Dog
Voiced by: Tom Kenny
The other end of the eponymous conjoined brothers. Dog is a happy-go-lucky dimwit who loves food and chasing vehicles, often to the frustration of Cat.
- A Head at Each End: Like Cat, his head is at one side of their body.
- Annoying Younger Sibling: To his older twin brother Cat, albeit usually unintentionally.
- Berserk Button: Stealing his bones from his bone cellar is really not a good idea.
- Beware the Nice Ones: Cat once learned the hard way not to actually make Dog angry.
- Big Brother Instinct: Inverted; he's very, very protective of his older twin brother, Cat.
- Big Eater: His appetite appears to be limitless.
- Break the Cutie: Dog is much more sympathetic than most people realize. He's been laughed at by the entire town of Nearberg for being a failure hero (Dog The Mighty), worked to the point of hypothermia in a sled dog race (Mush Dog Mush), almost sold off as a freak show attraction by his own brother after contacting a disease (Dog's Strange Condition), bullied by mailmen while in a depressed state (Fistful Of Mail), driven to the brink of paranoia (Safety Dog), spent an entire episode thinking he was allergic to his own brother (Sneezy Dog) and has been cheated and lied to several times by his own brother. He also came dangerously close to crossing the Despair Event Horizon in the Great Parents Mystery special.
- Cartoon Dog Breed: He's an ambiguous-looking orange-yellow dog with darker orange spots. He's whatever dog breed ends up conjoined twins with a cat.
- Character Catchphrase: "Hi-ho diggety!!" Dog even calls it his catchphrase! He gets it from his mom.
- Cloudcuckoolander: He is easily distracted by balls, garbage trucks, bones, food, and his overactive imagination.
- The Cuckoolander Was Right:
- In "The Great Parent Mystery", Dog comes up with a lot of ridiculous theories about what happened to his and Cat's parents, such as being frozen in a block of ice at the North Pole, being abducted by aliens, and being enslaved by evil mutant tree gnomes. Their adoptive parents later reveal that at least some of Dog's theories happened to them while they were looking for CatDog.
- In "Meat Dog's Friends", Dog believes that meat comes from meat trees planted by Johnny Meatseed. After going insane from learning that meat is made from animals and attempting to eat his brother Cat when he can't go through with eating vegetables and rocks instead, it turns out that meat trees and Johnny Meatseed actually exist.
- The Cutie: His goofy, sweet behavior gives him this status. He gets it from his mother.
- The Ditz: Is often brainless, needing Cat to do everything for him.
- A Dog Named "Dog": Literally.
- Dogs Are Dumb: In fact, a good portion of the dogs on the show are portrayed this way.
- Dumb Blond: Dog doesn't normally have hair, however a flashback to The '70s has him with blond hair.
- Dumb Is Good: Usually is the more reasonable one if Cat is being a major Jerkass in the episode.
- The Fool: Dog frequently causes multiple catastrophes and Amusing Injuries though more often than not fate is on his side and leaves him unscathed (and then punishes Cat twice as hard for the both of them).
- Genius Ditz: He's actually shown to be quite the Supreme Chef in the Ingrid Twins' debut episode.
- Happily Adopted: The big movie about finding their long lost parents, they find out in the end that the parents that raised them as kids had adopted them. And were also a talking frog and a sasquatch. They never find out who their biological parents are, but are content to reunite with the ones that cared for them.
- Idiot Houdini: Dog is a hyperactive dimwit that causes chaos with his canine tendencies. It is usually Cat that suffers the consequences for it however.
- Innocently Insensitive: Most of the time, Dog never realizes just how much pain (whether physical or even emotional) he causes his brother at times.
- Keet: This critter has boundless energy.
- Kindhearted Simpleton: What he lacks in brains, he makes up for in kindness.
- Jerkass Ball: Sometimes acts more insensitive than usual. One example being in "Teeth For Two", where after he and Cat learn that whatever they eat affects the other's teeth and his eating habits have ruined Cat's teeth, he refuses to change his eating habits or take care of his teeth for Cat's sake, being uncaring for the pain he is causing Cat and leading to the brothers purposely ruining each other's teeth.
- Lethally Stupid: Has caused a lot of destruction just because he didn't know any better.
- Like Father, Like Son: Like Mother Like Son
- Manchild: Very immature... not that he shouldn't be, considering he's a dog, but combined with his ability to speak he qualifies as this trope.
- The Millstone: Dog is usually the one who gets the pair into trouble.
- Nice Guy: The nicer one of the duo.
- Only Known by Their Nickname: His real name is Caninius.
- The Pig-Pen: Almost never cleans up after himself.
- Ping Pong Naïveté: Somehow Dog is smart enough to know the ethics against cheating and doing schoolwork but not to realize that dragging his conjoined twin across the street may cause slight physical harm.
- Too Dumb to Live: Some of the things he does could have gotten them killed.
- Trademark Favorite Food: Bones, moldy meat, and garbage.
- Why Did It Have to Be Snakes?: Dog is terrified of ticks. He shares this fear with other dogs, most notably, The Greasers.
Supporting Characters
Winslow
"Whatta you, nuts?"
Voiced by: Carlos Alazraqui
A blue, Brooklyn-accented mouse who lives in the walls of CatDog's home. He's usually on pretty good terms with his neighbours, but has been known to take enjoyment in tormenting them from time to time.
- Abusive Parents: His main purpose in life is to make CatDog miserable. In "The Great Parent Mystery" it's revealed that he found them as babies and raised them.
- Black Bead Eyes: One of the few characters with this eye style.
- Cartoon Creature: Despite being referred to as a mouse, he doesn't really look like one.
- Character Catchphrase: "What are you, nuts!?"
- Lampshaded in "CatDog Candy""I'm not even asking anymore, You guys are nuts!"
- Lampshaded in "CatDog Candy"
- Characterization Marches On: In the first few episodes in the production order, Winslow was less of a malicious prankster and more of a friendly gadfly. He was a lot nicer to CatDog too, to the point that Cat actually seemed to like him.
- Deadpan Snarker: Part of his rude behavior toward CatDog is to make remarks at their expense.
- Drop-In Character: He lives in CatDog's house (the finale implies that he was its original owner) but has his own place inside the walls of said house. His arrival on the scene usually involves him emerging from a small hole in the wall and saying "Hey there, CatDog!"
- Even Evil Has Standards: In "Dog Power" he's genuinely appalled at Cat's treatment of Dog.
- Evil Laugh: His signature cackle.
- Informed Species: He's allegedly a mouse, but looks more like a Smurf.
- Jerkass to One: Or two. The majority of the time, he is an unbearable asshole to CatDog, mostly Cat. The occasions where he doesn't insult or act rude to CatDog can be counted on one hand.
- Jerk with a Heart of Jerk: In "All You Need Is Lube", he even schemes to help CatDog escape from an overly grateful Lube's asphyxiating grip even though it was because he also wanted him out of the way, and in "CatDog Doesn't Live Here Anymore", he starts mourning over CatDog's absence after a while even though it was because he was missing them as punching bags. His chances at redemption in "The Great Parent Mystery" all end up wasted by him continuing to be a douche to CatDog. He frequently looks like he's going to help them out on their journey only to insult them or make their predicaments even worse.
- The Napoleon: He's extremely small and not a very pleasant person.
- Sitcom Arch-Nemesis: To Cat.
- Sidekick Creature Nuisance: Invoked. He considers himself a "harasser".
Mervis and Dunglap
Mervis.
Dunglap
Voiced by: John Kassir
A pig and a weasel who are among CatDog's few friends.
- Dark Horse Victory: When CatDog races Mindy to the top of an unnamed mountain, Dunglap somehow made it up first since Cat forgot his earmuffs.
- Informed Species: Dunglap looks more like some kind of rodent than a weasel.
- Messy Pig: Mervis, for a given definition of "messy".
- Nice Guys: They're among the few characters, along with Lola, who treat CatDog nicely.
- Only Sane Man: They are the only normal characters in the series.
- Those Two Guys: They don't seem to serve any other purpose than this.
- Vitriolic Best Buds: Often seen bickering and yet are always together. And their fighting is less than impressive.
- Wicked Weasel: Averted most of the time with Dunglap, who is one of the nicest characters on the show, but revealed to be a straight example on a couple of occassions that involved abuse of power.
Mr. Sunshine
Voiced by: Billy West
A green-skinned humanoid of unclear species usually seen working various odd jobs. Despite his name, he is anything but sunshine.
- Bystander Syndrome: He'd probably be the Only Sane Man if he didn't succumb to this all the time.
- Cartoon Creature: Nobody's quite sure what he is.
Word of God says he was originally supposed to be a monkey. - Deadpan Snarker: Sometimes.
- Dreary Half-Lidded Eyes: He usually sports this expression, considering his often emotionless state of mind.
- The Eeyore: Subverted; he isn't so much depressed as he is boring and deadpan.
- Hates Everyone Equally: Sunshine hates everyone and everything, especially Dog.
- Ironic Name: He's anything but sunny. Zig-zagged in that "The Ballad of Ol' 159" reveals that he used to be as cheerful as his name suggested.
- Lazy Bum: He often falls asleep while doing his job.
- The Load: He is never really any help at all.
- Major Injury Underreaction: Just about any time he's injured for one reason or another, his response is a deadpan "ow." The most he ever expresses is after a dentist appointment, in which he complains "Owwwwwww, I'm in excruciating paiiiinnnnn", in the same deadpan tone.
- No Celebrities Were Harmed: He’s basically the show’s equivalent of Ben Stein.
- Not So Stoic: In "The Ballad of Ol' 159", he screams normally when he is being chased by Dog in the eponymous garbage truck.
- Perpetual Frowner: He very rarely smiles.
- The Stoic: Always speaks in a dull monotone voice.
Lola Caricola
Voiced by: Nika Futterman (credited as "Nika Frost" until "The Great Parent Mystery")
A "yellow-bellied whippoorwill" with a Hispanic accent. She's a zoologist who first showed up to study CatDog, but soon became one of their closest friends.
- Action Girl: She gained her love of zoology after helping her family wrangle cattle. Not to mention the fact that she can go toe to toe with the Greasers.
- Artistic License – Ornithology: She looks and acts nothing like the type of bird she's supposed to be.
- Character Catchphrase: "Unbelievable!"
- Chuck Cunningham Syndrome: She doesn't appear in any of the episodes after "The Great Parent Mystery"
- Feather Fingers: To the point that her wings remain armlike even when she's flying.
- For Science!: Most everything she does. Justified because she's a zoologist.
- Genki Girl: She's very perky.
- Informed Species: She's apparently a whip-poor-will. Specifically, she says that she's a "yellow-bellied whip-poor-will", a species that doesn't even exist in real life.
- The Lad-ette: She's very tough and not so feminine.
- Nice Girl: She is one of the few characters consistently portrayed as being on good terms with CatDog.
- Not So Above It All: She's always willing to join in with CatDog's shenanigans.
- Only Sane Woman: To some degree.
- Sidekick Creature Nuisance: Over-the-top, loud, repetitive, especially with catch phrase.
- Phrase Catcher: "Hola Lola", usually said by Cat.
- Ship Tease: Occasionally seems to flirt with CatDog, although that was mostly in her first appearance.
- The Smart Girl: She's very intelligent.
- Strong Family Resemblance: Her mother looks like an overweight version of her. It is shown in "The Great Parent Mystery" that her father also resembles her a bit.
- Spicy Latina: The Lad-ette, if she were of Latino descent.
- The Thing That Would Not Leave: In her first appearance "Sweet and Lola", where she decides to study CatDog and in doing so keeps invading their privacy and never leaving them alone. Subverted in that she eventually tells them indignantly that she would have left if they asked her to.
Randolph Grant
Voiced by: Billy West
A suave and trendy feline and a local celebrity in Nearburg.
- Ambiguously Gay: Overall the mannerisms of this celeb and posh stylish character show hints of being gay and at times he seems to have a thing for Dog, especially in episodes "CatDog's End", "Dog the Not so Mighty", and "Dog Ate It".
- Character Catchphrase: "And I LOVE it!"
- Dodgy Toupee: It is revealed in "Picture This" that his hair isn't real.
- Kent Brockman News: He's Nearburg's newscaster
- Nice Guy: Treats CatDog better than most Nearburg citizens
- No Celebrities Were Harmed: He's a dead ringer for Cary Grant.
- Upper-Class Twit: Granted, he's a relatively amicable one.
The Ingrid Twins
Voiced by: Laraine Newman
A pair of female cats who have dated CatDog a few times.
- Always Identical Twins: They look alike and even have the same name.
- Opposites Attract: In one episode, it's shown that the Genki Girl Ingrid likes Deadpan Snarker Cat and the Deadpan Snarker Ingrid likes Genki Guy Dog.
- Sexy Scandinavian: Both are beautiful blondes and presumably Swedish, sharing a stereotypical Scandinavian name.
- Ship Tease: They often appear on dates with CatDog.
- Sibling Yin-Yang: One of them is a Genki Girl and the other is a Deadpan Snarker, hence why they're pretty much perfect for our conjoined duo.
Antagonists
The Greasers
(from left to right) Cliff, Shriek, and Lube
The archenemies of CatDog. A trio of thuggish mutts who hate cats and beat up any they meet. The gang consists of the brutish leader Cliff; the astoundingly moronic Lube; and the diminutive Shriek, who is the sole girl of the group.
- Big, Thin, Short Trio: Cliff is the big one, Lube is the skinny one, while Shriek is the short one.
- Black Bead Eyes: Like Winslow, Shriek has these. Lube had these as well, but in the pilot "Dog Gone", as well as more hair combed at the front.
- Co-Dragons: They sometimes help out Rancid Rabbit, when he's the main antagonist of the episode.
- The Dreaded: The Greasers as a whole are this to CatDog (more specially Cat).
- Dumb Is Good: Zigzagged; although he's still an active part of the gang in their mayhem and bullying, Lube is both the dumbest member and the nicest.
- Easily Forgiven: They once caught Lola spying on them when she claimed she wanted to join them, really she was trying to help CatDog discover their Achilles' Heel. They find her camera and smash it, but quickly decide that since she was tough enough to try spying on them she's tough enough to join them and know what their one weakness is. They discover she's helping CatDog before they can tell her, but don't want her to leave empty handed so they show her "the best way to beat a CatDog."
- Embarrassing First Name: Cliff's name is short for Clifford, which he isn't proud of — although he thinks it's better than his Embarrassing Middle Name of "Maurice". Shortly after, it's revealed that Lube's name is Ignatius, though he doesn't mind.
- Embarrassing Last Name: Ironically, though, Cliff doesn't seem to be ashamed of his last name, even though it's Feltbottom.
- Fantastic Racism: They really hate cats. Crosses over with Animal Jingoism because they're dogs.
- Fat Bastard: Cliff is the chubbiest and the meanest.
- Freudian Excuse: "Rich Shriek, Poor Shriek" seems to hint at Shriek having one—her mother is shown to be rather controlling and when her attempts at bribery fail she flat out screams at Shriek, which actually manages to intimidate her into obedience. Her dad appears to be nicer, but also a bit of a blissful space case.
- Gang of Bullies: The group of three make up a team of delinquents.
- Genius Ditz: Lube is incredibly stupid most of the time, but he's also revealed to be a skilled mechanic, as well as an excellent baker.
- Hidden Depths: All three of them have these. Cliff is very much in touch with his feminine side, Shriek has a crush on Dog and is Secretly Wealthy and Lube is a skilled mechanic and a great cook. He's also apparently fluent in Spanish.
- Informed Attractiveness: Probably played for laughs, but a couple of episodes have Winslow commenting on Lube being attractive (granted in one of those instances Lube was disguised as a woman).
- Insufferable Imbecile: Cliff is the meanest Greaser, but none the wiser. Subverted with Lube, as he's too dumb to know any better.
- Jerkass: A trio of bullies who always pick on CatDog.
- Jerkass to One: They love to pick on CatDog and other people as a whole but they often tend to single out Cat. Especially Cliff.
- Laser-Guided Karma: There are times when their Jerkass behavior is answered for. Even Cat, their biggest target, has managed to clobber them full stop a couple times.
- Like Parent, Like Child: Lube's parents are shown in the finale, and they're just as dumb as he is.
- Meaningful Name: Shriek has a very squeaky, raspy voice that makes her sound like she's shrieking all the time. And, boy, does she shriek.
- Moment of Weakness: In the episode "All You Need is Lube", a tick attaches to Lube's toe. Cliff and Shriek are too afraid of the tick to help Lube and run away, while Cat takes the tick off, so Lube decides to serve Cat for saving his life. When Cliff and Shriek come back, lying that they left to get help, Lube is not fooled and angrily calls them out for abandoning him and tells them he's with Cat now. Cliff and Shriek genuinely feel bad about letting Lube down and do try to make it up to him to earn back their friendship.
- Nice Mean And In Between: Lube is the Token Good Teammate and too dumb to know any better, Cliff is an unforgiving bully, and Shriek does have a softer side, but is normally malicious.
- Only Known by Their Nickname: Cliff's real name is Clifford, Shriek's real name is Alice and Lube's real name is Ignatius.
- Quirky Mini Boss Squad: When Rancid is the Big Bad, they're usually acting as his minions.
- Pet the Dog: Occasionally, they will set aside their antagonism toward CatDog to assist them in a common goal.
- Real Men Wear Pink: Cliff takes ballet. He's not only really good at it, but he's also really proud of it. Mostly because it helps make him better at being a thug.
- Secretly Wealthy: Shriek. She really hates it, though.
- Spoiled Brat: Shriek is a wealthy rebel.
- Strong Family Resemblance:
- Shriek and her parents are shown to look a lot alike in "Rich Shriek, Poor Shriek".
- In "Back to School", CatDog encounters Cliff's nephew Biff, Shriek's niece Squeak, and Lube's nephew Bartholomew, who all look like their uncles and aunt. In a flashback, we also see Cliff's dad, who looks just like his son.
- It is shown in "The Great Parent Mystery" that Cliff's mom also looks like her son and that Lube bears some resemblance to his parents as well.
- Team Mom: Lube, if you can believe it. It's shown a couple of times when he bakes snacks for Shriek and Cliff, and in one episode he irons Cliff's clothes and speaks to him in a decidedly mom-like fashion about it.Lube: Extra starchy, just the way you like it!
- Terrible Trio: These three are always looking for trouble.
- Token Good Teammate: Lube by himself is not that bad. He just follows along with the others, and is too dumb to know any better.
- True Companions: Several episodes show them to be this. They may be rather nasty bullies, but they stick together. There are times where this doesn't hold up though.
- Ungrateful Bastard: Cliff in "Squirrel Dog" - even though CatDog were the only ones to show him any kindness when he was considered a freak, he goes straight back to bullying them once he gets unstuck from Eddie the squirrel.
- Unmanly Secret: Cliff has several that he reveals in one episode, including an Embarrassing Middle Name and the fact he still wets the bed. Ironically, the one secret of his that Cat and Dog think is this trope turns out to be something he's actually really proud of.
- Unsettling Gender-Reveal: No one seemed to realize that Shriek was a girl, not even her fellow Greaser Dogs. Everyone was horrified when they found out, mainly due to them not recognizing her, and finding her quite attractive when she wore a dress.
- Villainous Crush: Shriek has a crush on Dog. Strangely enough, Cat seems to be attracted to her. A few episodes suggest that Dog reciprocates Shriek's crush. In one where they're all convinced that the apocalypse is coming, Shriek confesses to and kisses him, prompting Dog to go into Post-Kiss Catatonia with a big goofy grin on his face.
- With Friends Like These...: The Greasers, despite being rather nasty bullies, are close and do stick together. However, at the same time there are times where they are willing to turn on and leave each other when they see each other as weak and different.
- In the episode "Squirrel Dog", when Cliff gets Eddie the Squirrel stuck on his back, Lube and Shriek refuse to help Cliff and abandon him, because in their eyes Cliff was now a freak. They only take him back when Cliff accidentally gets Eddie off his back and Cliff shows he learned nothing by going back to being a bully.
- In the episode "Cliff's Little Secret", when CatDog find out that Cliff takes ballet dancing, they no longer fear him, and it drives him insane, with Shriek angry that CatDog no longer fear them. After being laughed at by CatDog during almost the whole episode, Shriek and Lube decide to leave Cliff, with Shriek telling Cliff she love him like a brother, but she never want to see him again, with Lube admitting the same. When Cliff begs them not to go and asks what will happen to him, Shriek admits she doesn't care. It's only when Cliff discovers why CatDog stopped fearing him and make them fear him again do Shriek and Lube take him back.
- You Are What You Hate: "The Great Parent Mystery" reveals that Lube is part-cat, his father being a dog and his mother being a cat.
- Why Did It Have to Be Snakes?: All three of them are terrified of ticks which was the main plot point of one episode where Cliff and Shriek leave Lube to having one stuck on him until Cat removes it. They all share this fear with Dog.
Rancid Rabbit
Voiced by: Billy West
A large green rabbit who antagonizes CatDog just as often as the Greasers do. Somewhere between the mayor and the CEO of Nearburg, he seems to have managerial-level positions in virtually every business in the city.
- Big Bad: Nearly every episode he's in has him as the main antagonist.
- Big Bad Wannabe: Deteriorates into this as the show went on.
- Black Bead Eyes: He has small dots for eyes like several other characters.
- Character Catchphrase: "Leaping lumbago!" and "What what WHAT!?"
- Corrupt Corporate Executive: It's implied that he actually owns Nearburg.
- The Ditz: Sometimes.
- Even Evil Has Standards:
- Seeing CatDog swarmed with psychotic fleas and the flea belt no longer being enough to help them is enough to convince him to give them a flea bath with no apparent ulterior motive.
- In the dog show episode, he chews out the other contestants for attacking Cat when his and Dog's cover is blown, telling them that they should know better than to act so uncouth.
- Fat Bastard: Not as chubby as Cliff, but still counts.
- Green and Mean: A green rabbit with SO much emphasis on "mean".
- Jerkass: He's very antagonistic towards CatDog. In one episode, he bans them from a taco restaurant for no reason.
- Mayor Pain: Since he owns all the jobs including the government positions.
- Meaningful Name: His name best describes his rancid personality.
- Names to Run Away from Really Fast: Rancid Rabbit.
- New Job as the Plot Demands: He has all the jobs. What job he is doing depends on the episode.
- Pet the Dog: He'll sometimes help out CatDog when it's absolutely necessary. He's not the least bit antagonistic in "Flea or Die" (in which he plays a doctor), and at the end of the episode, when the duo show up at his clinic covered in fleas and begging for a flea bath, he freaks out and immediately gives them one without hesitation.
- President Evil: Subverted in A Dog Ate My Homework—he's depicted as the president in it, but he's less evil so much as he is incompetent and lazy.
- Species Surname: Rancid Rabbit.
Eddie the Squirrel
Voiced by: Dwight Schultz
A mangy little squirrel with a bad attitude who idolizes the Greasers and seeks to join their gang.
- Ambiguously Gay: He was more than content to be stuck with Cliff forever the moment he was glued to his jacket.
- Harmless Villain: Of all the people who actively antagonize CatDog, he's the most ineffectual and isn't really a threat.
- Ineffectual Sympathetic Villain: Heavy on the ineffectual, light on the sympathetic.
- Informed Species: He's supposed to be a squirrel?
- Motor Mouth: Nobody can shut the little twerp up.
- Not-So-Harmless Villain: He almost killed Lube with a tick at one point and built a giant robotic cat to get revenge on the Greasers and enslave the town.
- The Sixth Ranger: Despite the Greasers dislike towards him, there are a few episodes where he is shown hanging out with them without any problems. One example is Rinky Dinks where he is a member of their ice hockey team and joins them in kicking everyone off the ice.
- Sidekick Creature Nuisance: A short squirrel who is obnoxious.
- The Team Wannabe: He wants to be a member of the Greasers, but Cliff, Lube, and Shriek won't give him the time of day.
- Vocal Evolution: His voice becomes a lot more high pitched after his first appearance.
Tallulah Headbank
Voiced by: Maria Bamford
A feline actress whom Cat has an enormous crush on.
- Bitch in Sheep's Clothing: A gorgeous movie star who is also vain and snobbish.
- Cats Are Mean: She's an unpleasant cat.
- Celeb Crush: Cat has one on her.
- Jerkass: Noticing a pattern here?
- Nice Character, Mean Actor: Tends to play sweet love interests, but is a huge snob.
- No Celebrities Were Harmed: A spoof of Tallulah Bankhead.
- Pet the Dog : She declares Cat her soulmate when he reveals that he has every quality she's looking for...right until Cat accidentally burns her dog.
- Rich Bitch: Very rich, very nasty.
- What Does He See in Her?: With all the hate and abuse she dishes out on Cat whenever he's around her, you'd think he would've given up on her by now.
"The Mailman"
Voiced by: Dave Thomas
A fast-moving lizard who works in postal delivery.
- Arch-Enemy: To Dog.
- Bald of Evil: When seen without his hat on, he is shown to be bald.
- Big Bad: Of "Fistful of Mail".
- Formerly Fat: As the Paperboy, he was so chubby as to be unrecognizable as a slender, sleek adult. An interesting example, as its only relevance to the plot is to reveal just why Dog didn't recognize him at first.
- Jerkass: He picked on Dog ever since he was a puppy.
- Lizard Folk: He appears to be a very fast lizard in cowboy attire.
- No Name Given: He's never given a name and is called "Mailman" in the credits.
- Schoolyard Bully All Grown Up: Used to be a paperboy who mocked Dog for being too slow to get the newspapers he threw.
- Slasher Smile: Wears one whenever he's not being a Smug Smiler.
- Smug Snake: An appropriately reptilian one too, though he's a lizard.
- Super-Speed: His specialty. He's the first and last mailman to surpass Dog in speed.
- Unstoppable Mailman: The first mailman Dog couldn't stop. Until the end, that is.
- Villainous Breakdown: Has one after Dog defeats him.
Spoiler Characters
Spoiler Characters
CatDog's parents
Voiced by: Billy Bob Thornton (Dad), Jane Krakowski (Mom)
CatDog's (adoptive) parents, whom the pair set out to find in The Movie "CatDog and the Great Parent Mystery".
- Bigfoot, Sasquatch, and Yeti: Their mom appears to be some kind of sasquatch-creature—we never find out what she is and not even her husband seems to know.
- Character Catchphrase: Dog got his from his and Cat's mom.
- Deadpan Snarker: CatDog's dad is one, which is where Cat gets it from—seeing and hearing their father make the same sarcastic remark as him is what ultimately leads Cat to accept that these two are indeed his and Dog's parents.
- Genki Girl: Dog gets his cheerful personality and energetic demeanor from his and Cat's mom—the two bond almost instantly.
- Good Parents: They loved CatDog dearly, even though they weren't their biological parents. When they were separated, the two of them spent almost their whole lives searching for their sons.
- Happily Married: They are very clearly happy together.
- Interspecies Adoption: They had found CatDog when they were just babies and immediately took them in as their children.
- Interspecies Romance: Their dad's (presumably) a frog while their mom appears to be some kind of sasquatch-creature. Despite that, they're clearly very happy together and are very much in love.
- Like Father, Like Son: Cat takes after their dad while Dog takes after their mom.
- Mama Bear and Papa Wolf: To CatDog; they spent years searching for them after they were separated.
- Unnamed Parent: We never find out their real names—Cat and Dog only ever refer to them as "Mom" and "Dad" while the frog refers to his wife as "Babycakes" at one point.
- Walking Spoiler: Knowing too much about them spoils the events of "The Great Parent Mystery".
- Wham Line: The mom has one when she finally speaks:CatDog's Mom: HI HO DIGGETY!
