Flys suck I had horses,chickens, dogs cats,almost goats. But they are here .bests stuff in side and out is fly strike.not cheap but good.i dilute it teaspoon,to a qt.in spray bottle.spray door ways.all hard surfaces.doesnt hurt animals.u can drop chunks,just keep out of reach of people,and critters.friend sticks it’s in window sills,?best ever.