Pepper spray? A good fence? I'd never think of putting my own dog to sleep because of a neighbor's dog not liking mine. I'd be appauled for somebody to suggest that to me. Not to mention there are kids around. You can't put a kid to sleep because of some inconvinient dogs. With this many bite complaints, the dogs should be seized. Make sure you call the police each and every time you see them running loose. The more bad marks against these people, the better.