Ripper is a bulldog, owned by Marge Dursley. He likes to take his tea from Aunt Marge’s saucer. He always travels with Marge because he “pines” if he is away from her. Marge has twelve dogs, but Ripper seems to be her favourite (PA2). Ripper doesn’t seem to like anyone besides Marge. He seems to dislike Harry the most as he growls when they are in the same room (PA2).
"Ripper had chased Harry out into the garden and up a tree, and Aunt Marge had refused to call him off until past midnight" (PA2).