I knew something had the grass worn down, just wasnt sure what it was.Just start feeding the dogs high protein food with a bit of miracle grow in it and you will have big tall grass in no time (just kidding of course)Kinda in the category of a kid with a new go cart the grass doesnt have much of a chance,I think I would check around and see who could do a soil sample for you then get several samples from around your yard to see if it was the same everywhere.I took one at a house i used to live in once and a feed n seed company had it checked for me,it came back needing 100#'s of several things to get the soil in check....needless to say the grass started looking just fine,well like everyone elses lol