Runt

Runt (voiced by Frank Welker) is a big scruffy dog with shaggy fur on his head. He was dumped by his owner, a man who thought he "wasn't independent." He speaks with similar vocal mannerisms as Dustin Hoffman in Rain Man. He is loyal and friendly, but stupid, thinking that Rita is a dog. However, if someone says the word "cat," he would go crazy and look frantically around for it (however, he never noticed that Rita is, in fact, a cat). He can also be very heroic, saving Rita a few times. Runt would occasionally sing a duet with Rita, and rarely get a song for himself.