Many dogs can be trained to be trustworthy with chickens. This is not always possible. I'm pretty basic with my animals. They learn early on that I'm in charge and "no" means "no." When I had to introduce adult dogs to little Banty chickens, I took them out on leash and firmly corrected any chasing behavior. Then, off leash , I still had to smack a switch on the ground to get my mini- beagle's attention. I have a rescued coonhound/ Rottweiler? that isn't even going to be trained. He will always be leashed around the chickens. His prey drive and level of excitement are so intense (he literally freezes and trembles) I'll never risk it. There are more severe methods of correction that I choose not to use--don't get me started on shock collars. What kind of dog do you have and how old is it?