I have a 2yr old Golden Retriever who is trained to hunt goose, a 1 yr old pit bull mix, and a 2 1/2 yr old dachshund. I trust none of them-however my pit is probably the only one I will be able to teach most effectively to leave my chickens alone.
Because of our near tragedy with my little rescue/house chicken and my doxie, I have no doubt she would kill them any chance she has to be near them. After what she did, and what I did, to get that chick out of her mouth- she will still follow us around, excited, when we are holding the chicken, and lick her lips. My 12 year old loves her, but that little dog drives me insane. I have been unsuccessful in training her anything. She will even chase the cows at my brother in laws'. Dumb dog, they chase her too. When she had grabbed Carmen out of my hand and refused to let go, I had half a mind to put her in my bil's coop and let the Rooster deal with her.
I have let my pit sniff our chick and I tell him, "LOOK, its our baby...what a good boy..." and he is real good. He doesnt try to grab her, or get overly excited. He knows LEAVE IT, also- but I still wouldn't trust him with the chicken on the ground. I don't think he would hurt her intentionally. Put if he pawed her with one of those big feet, he would do some damage. (Ha, I just remembered last year, about 6months old, at my brother-in-laws, he actually caught a hen- pinned her to the ground-wings flapping. If he had wanted to kill her, he easily could have-by the time I made it across the yard to save her. But, he just held her down, with his head and front legs.He had selective hearing, so he didn't 'hear' my commands until I was right next to him- then he was like, "Oh, Hi Mom...let it go? Are you sure? Okay.." rotten pup!)
My one cat is proving to be very hard-headed. She has had a bucket of water dumped on her head when looking at Carmen, and then today, she was 'stalking' her, through the fence...I turned the hose on her and she got herself trapped in a corner, but I kept hosing her down until she ran off. Hopefully soon, she will learn that every time she looks at the chicken, she gets wet.