recently we had a massive flea problem by our cats that are outdoor cats, so frontline used and logical, of course, affects net the same from the very beginning .... somehow seems my husband to have the blood tastier, because only he is / was by the fleas bite, I do not .... we have tried advantage, from the vet, the frontline net really recommended, still think constantly fleas on cats, we also for the environment of this ardapspray ordered, believe the critters have become immune to everything .... the stench here is spray bearable, maybe to bearable .... well, helping it does already, frontline, but if the fleas are there first, it is more difficult because .... there is certainly still a lot of things that you can try, and I'll have to make probably