Ugh, fleas like crazy in my grass outside. What can I used besides DE that's safe and can do an entire acre? We already did the entire yard with DE last weekend and we don't see a difference. We are treating our dogs with Frontline and I don't have fleas in my house, but the dogs are non-stop scratching and while I can't find fleas on them, I can find bites. When you go outside in yard you can literally see them jump on you. The chickens free range during the day, but they seem to be fine. I don't see them scratching nor do I see fleas on them. What can I do that's safe for them? Or safe enough if I keep them in their run a few days?