Hello, I have recently got a flea infestation in my yard and house, I have two dogs which I have both just treated, however the fleas are still in my house and yard, I have 10 free ranging chickens and two ducks that stay in my backyard in town, but apparently they don't eat fleas? Is there anything I can put in my yard that is a safe way to control them? I heard granules are a no go. Makes sense, I don't want my chickens ingesting any poison. Is there anything I can do for the outside? Any help would be greatly appreciated. Thank you all.