I have 3 Jack Russells, natural hunting intinct, but are fine with my Orpingtons, no problems when I had house rabbits either. They have been told no, and that is it!! the Orpingtons are large birds, and wherever the girls are, so is my large rooster Boris as a protection, they give him a wide berth, the only thing I dont do, is throw out scraps to the chooks if the dogs are out, I think that may invite trouble, but apart from that precaution, they all live very happily together, depends on the dog and training, but even hunting dogs should have training and you should always be the one in charge, supervise and monitor is the only advice, our chooks have been around for over a year now and all is good in the garden