Hi, I've had my chickens for about 3 weeks now and Buddy has been pretty good around them. He whimpers when I'm in the pen and when they make a fast move he jumps at them a bit. I've had him on leach when they are out of the pen and he's been getting better and better with them. For the past week he's been off leash with them and I've had no problems. Today I had them out free ranging and Buddy was with them behaving himself. ...until I went in the house for a minute. I heard a racket and he had one of the chickens cornered and seem to be right after her. He didn't hurt her and I hauled him off. Then he went back after her again, but again he didn't hurt her. I'm so disappointed in him and I don't know how to handle this. Any suggestions? I've lost my trust in him and I hate that. He's always been such a good dog. Part Border Collie, part lots of everything else.