What can I put on my grass that will keep a neighborhood dog from pooping there?

[Lopper]

For seven years, this anonymous perpetrator has been doing his business - same spot almost always. Never during the light of day, as I've never been able to put my hands on this owner that deserves both the $200 fine our city imposes plus the wrath of myself . Last straw came this Thanksgiving when the poo ended up in my driveway on a pile of newly fallen leaves... which stuck to shoes... which came into my house. Today I am in need of a carpet cleaning machine big time - now this dog-owner jerk has finally hit me in my pocket - I am done being tolerant. Seven years of cleaning this same poo from the same place is done. I am thinking now of whatever nasty and pain inducing substance I can place along my lawn perimeter to prevent this pooping perpetrator from going there. It is obvious that whoever is behind the leash doesn't give a s*** - oh, excuse me, they do actually 'give' a s***, they just leave it to other homeowners to deal with. As this is surely done during hours when our household is asleep, what can I put on the grass that will not kill it (grass) but make the dog wish to go anywhere but there? I would prefer to set up a motion detector bb gun to hit the owner where it hurts, but since I can't do this safely I need help! If it pains the dog and requires vet assistance, I regret the pain to the innocent animal but his owner can pony up -after seven years of cleaning this poo from my yard and now a $200 carpet shampoo - I am very much less than sympathetic. Do you think perhaps the pain of this a-hole's animal will make him understand he/she is a complete and utter loser? Sigh. Likely not.... Okay...just some awful smell to keep the poor unguided beast from pooing all over my front yard!!!!! I don't wish to hurt an animal due to the owner's problems but the animal is obviously the only one in charge of the poo... what will keep them out without causing injury to the animal? If it burns their feet but won't injure them, I'm good with something like that. Help!!!!