Salty,
Get a low powered Daisy red rider BB gun and give him a shot in the rump. It will not break the skin, but will feel like a bee sting. After a few times, the dog will learn to stay away from your yard.
When I was a kid, my brothers and I would wear my Dad's fencing helmets and shoot it out all the time.....hope my son never hears this story.
sean
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