CatDog (1998)

S1E11 The Pet

While rummaging through the dump, the Pet-CatDog discovers an injured Roach, and Dog is eager to adopt it as a new pet. Cat, however, is intent on getting rid of the creature and grows increasingly frustrated with 'Roachy.' In a moment of exasperation, Cat buys a device aimed at exterminating the Roach. However, when Roachy unexpectedly saves Cat’s life, he comes to understand his mistake in judging the little insect solely by its appearance.