call the cops. or at least call animal control. ive done it many times on my inconsiderate neighbors who believe they're the only people living on this plantet. I don't know about your neck of the woods, but here in Snohomish County, Washington State, its illegal to let your animals, be it dog, cat, or tree sloth, off your immediate property without being on a leash. period. not to mention is downright VERY un-neighbor friendly. especially if you have a nice yard.
