Here was the scenario that triggered the question. I work in a small office building on a side street in a major city. Directly beside my office is a high rise condo building. Further down the street are houses and apartments so its somewhat residential, but less than 100 yards from a major road. My office has an obviously well taken care of lawn in front and is clearly private property. There are sidewalks on most of the street and it isnt really used as a through street, but it is more of a city street than a suburban neighborhood.
I was on the phone with my girlfriend in my office tonight and look out the window as some lady walks over from the condo building (which has grass in front of it as well) and gives her dog extra leash as it walks into our grass and takes a piss. Then she sees me looking at her and just looks up and waves. One thing to note is that she was no more than 20 feet from the edge of her condo's property. I thought this was really unnecessary, but my girlfriend seemed to think that dog's should be permitted to use the bathroom wherever as long as the owner cleaned up any crap.
I, of course, turned too OOT to settle the debate whereas she turned to google. She did find this link and a bunch of stuff citing that dog urine is damaging to grass:
http://abcnews.go.com/US/WorldNews/l...3#.T8bbfNVrNQF