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They don't all turn into bone crunching killers. My lab is 8 years old. He's from champion hunting bloodlines. He hunts pheasants and ducks. He also runs free with my chickens and has NEVER been a problem. He's my flock protector. He also breaks up squabbles between the hens, and checks them out when they squawk for other reasons. The lab we had before this one was also good with birds. One day he came from the little slough that's behind our barn carrying a live blue-winged teal. I took the bird out of his mouth, examined it and found no injuries. Honestly, the bird was in his mouth, just looking around as the dog carried it up to me. I released the bird, unharmed. About 10 minutes later he came back from the same area holding his mouth funny and with grass hanging out of it. I held my hand out, told him to "drop it" and he deposited two unbroken eggs in my hand! On the other hand, we had a lab puppy "retrieve" every chicken I had in one day. We had let the chickens out (about 8 weeks old, the pup wasn't a year yet) ended up having to leave, were gone longer than expected and I came home to find all 12 of my birds dead on the back step with a very proud puppy next to them. Needless to say, the pup hadn't been trained to leave them alone. Anyway, I don't think they become "bone crunching killers" so much as, "catch, carry and play with until it's dead" killers. That's what I've seen with some of our labs in the past. They would catch them, carry them around till they were dead and catch another. First time that happened, I put a fence up. The dog we had at the time figured out that he could run around said fence and the chickens would panic and fly over the fence so he could jump up and catch them in midair. (Much more fun than playing frisbee!) That's when I learned that chickens would fly and I needed to put a top on my pen...
OP, the only thing I can say is, training, training, and more training for your dogs. Until you feel they're trained, keep that fence hot. Some dogs may never lose that desire to kill chickens. I will say, though, that labs are trainable. I don't know about the other two breeds you have. It definitely helps if you can train them when they're puppies. I hope you can find a solution that works for you, your dogs and your birds.