My dogs have fleas bad. Been washing, spraying and dipping. Nothing I've tried seems to work until this last round. Think I have them under control finally. Treatment next week should be the last. It's not sandy here, more marsh mud than anything. Really liked sand in my brooder. May end up trying it in the run. The hay is not bad, just once it gets wet from all the rain we been getting it tends to smell a little. Been turning it over and that does help. Just been raining a lot more than normal this summer.