Lassie

Lassie is a collie dog.

History
When Homer talked about the dog heaven he said there were eight Lassies in the heaven and one of the Lassies in the dog hell: the mean one that mauled.

Before Homer had a performance Smithers said that he had some sad news to report, a small puppy, not unlike Lassie, had just run over in the parking lot.

When Little Monty stood up, Mr. Burns asked Smithers who did it remind him of. Smithers asked if it was Lassie, but it wasn't.

When Bart was up early watching the families animals on Lassie on TV.

According to Homer, Barney's birthday is on the same day as Lassie's.

When Santa's Little Helper sat in Homer's couch and watched the TV, he saw Lassie.

Willie sometimes calls Lisa for Lassie,  but also to Marge.