This happened to us at our previous home. The neighbor's dog was in our yard repeatedly. But would return home everyday before she got home from work. And of course "her sweet angel" would never leave her yard. Our dogs would get in fights with her dog defending their territory. I was constantly coming home to my dogs with punctures and scratches. Her dog was really mean and was actually aggressive towards non-dog people. It always toed the line with me, because I think it knew I meant business, but it was one of those dogs I knew was unpredictable. We eventually built a dog run for our dogs to defend them from her at-large K-9 on OUR property. Finally we got pictures, video actually, of her dog in our yard. She still said it wasn't her dog! Really? There's another Giant Schnauzer in this neighborhood that I don't know about??? When she got a second dog and that dog started escaping, I drew the line. The next time the dogs were in our yard, we put our dogs in the house and trapped her dogs in the dog run. I called Animal Control. Gave them a file of photos of damage: the fences, the chickens, and the wounds on my dogs from the past 2 months. When the officer went to remove her dogs from our run the Schnauzer charged him and went for his throat. He shot the dog dead right there in our yard. Thank god, that is was the officer that the dog had gone after and not some poor kid from the neighborhood. The mean dog was put down without suffering, or stress in a shelter. The neighbor's new puppy was taken to the pound where she never showed up to pay the fees. He was a sweet dog, and hadn't been with the irresponsible owner long enough to develop bad habits. We sent some friends of ours to the pound to adopt the puppy. In the end: one mean, unpredictable dog dead, one puppy SAVED form becoming a chicken-killing nuisance, and one irresponsible neighbor banned from owning K-9s in the county. The only casualties were two young roosters who valiantly laid down their lives so the girls could get to safety. We were so close to being one of those 5 o'clock news stories about a chewed up toddler!