If the dog owner pours water (carried from a water bottle) then the urine won't burn the grass.  Maybe suggest that dog walkers carry water to pour, so that it is just watering your yard, not harming it.  Nothing you can do about dog urine. 

 I have, however, been know to return the #2 to the rightful owners yard!  If I catch someone leaving it in my yard, then it will be returned to them.  I don't have dogs for a reason.  I love dogs...dont get me wrong, but if I wanted to spend my time picking up poop, then I'd have a dog of my own.

Well said!!!!!!!!!

This has got to be the most ridiculous post I have ever seen.  By the way, I think birds, rabbits, squirrels, chipmunks, rats, mice, snakes, moles, raccoons, opossums, etc. all pee/poop in your yards.

Look; you took issue with a resident who nicely and simply asked you to not allow your dog to stand and urinate in his yard. 

Apparently you trained your dog to not urinate in your house (maybe even your car, truck, or tricycle).  The ridiculous part started when you raised the objection to his lawful request.  You seem intelligent enough to know that it is trespass when you allow your dog to go onto private property in the first place.  Are you responsible for the litany of creatures in your comment? If you are, you should make sure they don't pee or poop in other peope's yards too.   Are you going to be a cooperative, courteous resident or not?  Or, ...