You're kidding!
Mine hates cats. And I've got at least 10-20 in the neighborhood. And a Rat Terrier is almost as fast as a cat. I know mine has cornered a few in the yard, but of course the cat climbs the fence and leaves her standing there barking. Don't know what I'm going to do when she dies. Guess every cat around will be using my flower beds as their personal bathroom. :shrug: And Rat Terriers can be mean when it comes to cats, etc. Mine older one killed a cat and quite a few rabbits. They were originally bread to kill rats.