Many dog owners are perfectly content with their “mutt” or “mongrel” dogs, and that is certainly true for cat owners as well. It is safe to say there are a lot more “mutt” cats around than purebred ones.
However, you seldom hear a cat owner speak about owning a “mutt” or “mongrel,” and there is no generally accepted slang term for such cats. Some owners refer to their pets as “alley cats,” and some say the pet is “just cat.” The proper term is “mixed-breed.” There are signs that the British term mog may slowly be catching on in America.