I have a 2 year old Great Pyranese black Lab mix. It's taken months but we've trained him that the chickens belong and he watches them very carefully. Keeps the cats away, keeps hawks away. He's quite attentive. Most of the time he is laying out there and the dumb chickens are crawling all over him. He lets them eat his food and there favorite place is in his dog house. But sometimes, out of the blue he will start chasing them. Twice he has gotten one. He doesn't injure them. Just catches them, holds them down. Yesterday he did this and grabbed it and held it in his mouth. I had to open his jaws to let the chicken out. It wasn't hurt and after it rejoined the group I can't tell which one he got. I don't know what is setting him off. This particular time the chicken was outside the fence. Maybe he was trying to get it to go back in. Idk. I can chain him up when they are out but the crazy chicken won't stay out of his house and food. For that matter they basically walk into his mouth. Help! Any suggestions?