Now I trust my dog completly around my chickens. He is a Shar-pei/Healer/German Shepherd/ ?, those are the only three we are certain of. When he was a puppy though he accidentally killed one of our roosters so he got banned from being around the chickens. He was chasing it and when he went to catch it he got its head instead of its tail. He liked playing with the tail feathers and once he realised it was dead he brought it to the porch and then laid down by it until I found it. I got rid of my other two chickens a couple months later but last year a bought a baby Americauna and raised her in a bird cage until she was big enough to go outside. The dog left her alone while she was in the bird cage. Then one day I was going into the chicken house to feed her and I forgot to close the door and the dog came in. The dog barked at her and went to chase her before I even knew he was in there but instead of running Kip(my hen) turned around and attacked my dog. Now he stays outside of the chicken house unless he is invited in. He no longer chases chickens when we go to other peoples houses either.