Answer
Welker voices two dogs in The Simpsons: Santa's Little Helper and Snowball II. Santa's Little Helper is Bart's dog who he won at a dog track. He is a yellow Labrador Retriever who is loyal and loving, but also clumsy and accident-prone. Snowball II is Bart's second cat, after Snowball I was killed by a cat burglar. He is a white Persian cat who is very mischievous and destructive.