Our new Chiweenie puppy was doing fine with the new pullets in our back yard. However one night we could see through the window that he was chasing them around the coop. I corrected the behavior, but noticed it happening more often. One night I went out to check on the coop and noticed one chicken was missing. With a flashlight in the back yard I eventually found the solo pullet hiding in compost. It was ok except that it was missing feathers on its back. Later I found lots of feathers in a place where it was easily corralled and molested by the puppy. This dog weighs about 12 lbs. Do you think that adding a Rooster or two will correct this behavior? I'm building a run but would still like them to free range when the garden is dormant.