Kills em on contact. Use it when bathing a dog. Only good for killing fleas on dog now. Wont do squat for the fleas tomorrow. I use it on pups.
If you are looking for longer flea control use ortho tree and shrub without the fertilizer. And you can use permithrin 10 concentrate.
Yea ive been using permithirin too just been washing dogs after hunting lately was wondering how fast dawn killed fleas