I have noticed a 12" area on the edge of my lawn by my sidewalk which is a deep, dark, green ring of grass with what looks to be a burn spot in the middle. The guy at Lesco said it is most likely a burn spot caused by a female dog. Of course because I have many dogs who go by on a daily basis I don't have the luxury of knowing which neighbor to tell to keep the dog off my lawn. Is there anything I can put down that won't harm the grass but will keep the dogs from doing their duty on my grass? A fence isn't an option here.