I have a boxer that is WAAAY too interested in my chickens. Lately, I've been locking my 3 big dogs in a large pen during the day while the hens are out, and letting them out in the evening when the hens go to roost. However, with 5 acres and the hens in an acre pasture, I'd rather not lock the dogs up. Trouble is, as soon as the first hen flies the coop (aka over the fence), I know Brody is going to be all over it like white on rice. What can I do to train this dog BEFORE he kills a chicken? He's about a year old, recently neutered, and sweet as he can be, but I KNOW he'd do a chicken in in a heartbeat. I've been taking him out there on a short lead just to let him get familiar and so I could pop him and/or fuss at him if he snapped at them. He hasn't done that (I probably haven't let him close enough), but he did chase after one when we were in there one day and he wasn't on the lead. We whipped him and locked him out of the pasture while the other dogs were in there with us. He just sat there so sad. I want my chickens safe, and I want my dog to behave and be happy. What do I do?