I was talking to my dad about this just the other day and he reminded me of something. When I was a kid, a neighbors dog came from down the road and got several of our birds. My dad caught the dog, very gently fut firmly tied the dead chickens to it's collar with bailing twine, and let it go. He did this after he talked to the neighbor, told him that next time we'd have to kill the dog. Dad told him about this very old cure for the problem. Leave the chickens tied to the dog for several days. They lose their appetite for poultry fairly quickly. The neighbor left the birds tied to his dog for four days. It never came back. I imagine they had to air him out for several days before they let him back in the house, too. I find this much less cruel than spray painting messages on the dog. Well, take it or leave it, it's up to you all.
Mark