Earl is a large, mean-looking, purple mutt who resembles a bulldog. He has yellow eyes, red rocker punk hair, and large lower teeth that protrude from his mouth and wears a spiked dog collar. He was initially homeless, and is occasionally locked up at Dr. HP Marten's Institute for Questionable Experiments, due to his viciousness.
Earl enjoys mauling Rocko, Ed Bighead, and basically anything else that is alive. He was adopted by Bev Bighead in the second season after his "fairy dogmother" frees him from Marten's lab, he ate her shortly afterwards. Ed Bighead hates Earl, and in turn, Earl hates Ed, but is loving towards Bev.