Hello, I will be getting 5 laying hens within the next couple of days. They will be my first hens, but my husband had some when he was younger. We have 3 goats and one dog. The dog is shorter than my Pygmy goats. He grew up on a farm until we got him at 1 and a half years old. He gets along well with the goats. We would like to have the hens free in our fenced in yard. I will start the first week having my dog on a leash each time I take him outside. What tips do you have for me so that I can better ensure he will not hurt the hens once I take him off the leash? He hasn't been around chickens in a while. He's used to goats, cats, and cows.