My vet said the heat and humidity makes nasty bacteria grow in the grass which is what caused Daisy's skin infection on her little feet. There's so many dogs around here that go potty in the grass. It's disgusting! I'm about to go buy a big sheet of artificial grass and put it on my balcony for Daisy. I can just wash it down with the water hose if needed. This is the second time she's got the skin infection on her feet from this grass out here.