I had a similar thing a few years ago. My Mrs had 2 black cats, the Harris hawk got used to them and didn't bat an eyelid . Then when I bolted black rabbits , she would anticipate the bolt, set off, but immediately swing round and come back! She hit normal rabbits like a sledgehammer!
funny ant it well i am going to try my puppy on it when its old enough only 7 months old still very puppyish be nice if he could stop it one more try then i we leave it !!!