Ruby is an Afghan Hound who greatly resembles Sylvie from the film Balto. She lives among Buster's gang of Junkyard Dogs.
Ruby seems to have a disturbing attraction to Scamp. It may be because she's one of Tramp's past girlfriends, or so she says. She even admits to Scamp she has "a bad case of puppy love." Ruby eventually leaves the junkyard with the other Junkyard Dogs minus Buster, and gets adopted by a family.