There is a "goatbusters" here that will hire you goats to deal with landscaping issues. Love the idea, myself. Apparently it only takes 2 or 3 times to teach them what to eat and what to leave alone, and after that you can have the goats just wander over with their dog colleague, and they leave when they're done and wander to the next customers'. I think the dog is for people not to bother them.