I have 6 dogs, which does complicate the training and lengthens the process... 2 of my dogs (my Jack Russel and my Border Collie/Australian Shepherd mix) are completely trustworthy. They are the only two that are allowed unsupervised with the chickens and turkeys at the moment. But they are also the only two that are allowed free run of the farm without worry of them disappearing for hours at a time. The others enjoy a 625 sq. ft. outdoor kennel with plenty of shade trees. The rest of my "pack" consists of a Golden Retriever, an Australian Shepherd, a Mini Aussie, and an Australian Shepherd/ Australian Cattle Dog cross. All of them are between the ages of 1 and 4 years, so relatively young. I have let them have access to my flock when I am right there to closely suervise. Mostly, they want to get the food, but if the chickens run, they love to chase! They will leave them and follow me back to the house if I start walking away and call them. None of them has tried to hurt the chickens, but I am afraid if they were left to their own devices, eventually it would lead to that. Some of them have a strong herding instinct, and I have used that to my advantage when I need to get them cooped up in a hurry. My AS/ACD actually helped me herd them from the woods into the coop when there was a terrible storm blowing in fast and found the one stray missing chicken even after it had started hailing. I also have them help me get the horses to the barn. I think part of being successful is understanding your breed, and using their natural instincts. I don't try to tell my dogs they can never herd my chickens, but that there are times when it is appropriate. I need to spend some time with each dog and the flock individually to try to get them to be more trustworthy, I just haven't had a chance. I did have an incident with my AS/ACD getting my turkey hen when the dogs got out of the kennel accidentally. She was trying to hide from him, and I truly believe he only wanted to get her to run. He had plenty of time (about 1/2 hour before I noticed) to kill her, but she only had ripped skin. No deep punctures at all. The Tom was holding his own against the other 3 dogs!! I never blamed the dog, only myself for not locking the kennel door. And like I said, I haven't put in the time I need to get them to where I would trust them.