Mouse? No, my pitbull retrieves dead vervets as trophies. In fact both are very diligent at rat hunting especially my Rottie cross Labby who sniffs them out. Ducks? No problem, my boy's got webbed feet and the softest bite. In fact, we've breed these animals so well and for purposes that my labbyxRottie has his incisors visibly flat almost shaved, while my pitbull has a strong jaw and teeth that are razor sharp. Why? Labby hunts, swims well. Coat is thick for cold water. Teeth can't pierce the flesh. Soft bite. Loves to fetch. Rottweilers are quiet, bouncers. Won't bark. Will bite. Butcher dogs, larger and strong. Pulls carts and farmer plows. Pitbull, love to fight. Will double or triple inside with adrenaline, feels little to now paint, rips and tears and pulls. Name one job for a cat? Mice fetching a cute trait. I've had my cats bring me dead snakes more than nice given the environment is not urban rat central