Well I do think the guy way overreatced, but I also think it's inappropriate to let your pets go to the bathroom on other people's yards. Yes I have two dogs, and no I don't let them potty in other people's yards. Dog urine can often kill the grass in the spot they go and make large yellow spots. Seeing as it is their yard, it's just not the right thing to do to let your dog do that. You should prevent her from doing so or pick another way to go, where she isn't going in people's yards. If you are walking in a neighborhood you can walk her on the edge of the street if you have to but it's not appropriate to let them urinate or defecate in other's yards. Sometimes dogs have diarrhea, and there is no way to pick it all up, and while YOU might pick it up, other people don't always. I always find other people's animal waste in my yard, and it really pisses me off. I don't let mine go out front, they have the entire back, so I don't appreciate other people just letting their dog go in my yard. I also walk in my yard barefoot, I don't want to walk in dog waste. That being said, that guy was rediculous, if it was me I'd have simly asked them nicely not to let their dog go in my yard.