The Lassie from the television series is a different Lassie than the one from Lassie Come Home.
- Lassie Come Home takes place in the United Kingdom during the Great Depression, while the TV series takes place in the United States in the 1950s-60s. The two Lassies also have different owners. The Lassie from the film would likely be long dead by the time the television series takes place. Though it is likely that the Lassie from the television series is in fact a descendant of the Lassie from the film.
Lassie is a succession of female collies.
- It explains how the Lassies in different franchises have various owners and how they are living in different times. "Lassie" is a name given to female collies who carry on the heritage of their earlier generations.
