I can't abide an animal too dumb to learn it's name and a good Terrier'll catch more rodents than a box full of Cats anyways so I see no reason for the species what so ever....
That's the problem, they are too smart. You would never train a cat to jump into ice cold water to go get a duck that is going to get taken away from them. In all honesty you will need to cull a few till you get a good one
