This has probably been answered a million times but I was wondering if anyone has been successful in curbing a young dog's high play/prey-drive? I have an almost 4-year-old black flatcoat named Riley and a 1-year-old chihuahua mix. When the chickens are out in the pen, Riley seldom moves. He lays down right outside the pen where he can see them the best and just lays there. I've been working with him on it, and now his attention will drift away from the chickens--he'll even briefly fall asleep. I'm just worried that he's still too interested and the chickens aren't scared of him at all, which adds to the worry. I've given them places to get up and away but again, they aren't scared so they won't run away. He's had direct contact with them out in the open but is still way too excitable for me to let him get too close to them. Riley's sister is the only one allowed in the pen when she comes over because she just flops over and let's them hop and scratch around her. She doesn't care in the slightest. We gave her to my cousin about 2 years ago and her being around my cousin's show rabbits has made her ultra maternal. However, getting Riley his very own pet dog hasn't made him any calmer around non-canine/feline animals. He attacked a chicken and shook it up pretty bad at a farm my cousin works at. The hen was so stunned we thought she was dead, but she got up and started walking around after about an hour. He probably won't try to kill them, but if he gets ahold of one--however, he will maim her if not kill her.... if I don't figure out how to make him completely uninterested, it's a timebomb. Has anyone managed to fix this behavior in an unaltered male lab?