In all honesty, I cant say it is their dog. It has a collar but no tags. It runs loose. I have seen them feeding and playing with the dog, they have a dog house but no other dog around, and everytime Ive chased it off it has ran back to their yard. So Im assuming its their dog, but without tags they could always tell me or the authorities that its not. I dont even know for sure thats what took my other chickies, im just assuming based on this attack and the others disappearing without a trace. When he ran off with my hen, there was no sign of anything in my yard. Anyway, we just finished with what my youngest daughter refers to as a " no dig fence" lol. Hopefully that will protect my other chickens even if the dog comes back. The one that was attacked this morning has finally come out of the coop and is scratching around with the others.