Brutus is the secondary antagonist of Race for Your Life, Charlie Brown. He is the Camp Bullies' vicious cat (which Sally misidentifies as a dog) who intimidates even Snoopy. He always attacks Woodstock. Like his owners, he is frightened by Linus' way of using his security blanket for a weapon. He is eventually beaten up by Snoopy as punishment for always attacking Woodstock.
- He is claimed to be the "Cat Next Door," who slashes at Snoopy.
- He reappears in Someday You'll Find Her, Charlie Brown, in which he is Mary Jo's pet. At first he attacks Snoopy as a stranger, but eventually softens.
- Brutus has the same name as Brutus & Nero in The Rescuers.