I should add, I have 3 dogs, and they are very protective of THIER chickens(actually 2 protect, the 16 year old just sorta lays there most days). Mine will go after anything else that enters the yard. Only real downside of this is that the chickens are not afraid of the dogs, and a fox looks an awful lot like one of the dogs, I watched it walk out of the woods, grab a hen that made no attempt to escape, and get back in the woods before I realized what happened, the next time I saw the fox, it got chased back into the woods with buckshot.