Somebody posted something like this on the forum recently. There was a suggestion about buying this pee-post at the pet store. I was like, "pee-post? What the heck is that?" Two days later I got a pet catalog and sure enough, there was a pee-post for sale. It has some kind of pheromone scent that makes dogs pee. It's a post you stick into the ground. How about you try that? Maybe it'll work. Good luck.