The Simpsons (1989): Season 14, Episode 19

14 - 19: Old Yeller-Belly

When Homer is trapped, the dog ignores him and he is saved by the cat. Homer then says he has no dog. H.K. Duff, owner of Duff beer makes the Simpsons dog, Santa's Little Helper the Duff mascot. Blackboard reads 'my pen is not a booger launcher'.