I've used it for years to spray on my dogs - best flea killer ever invented. Take your dog out into the back yard, spray it on their coat rub it in a little and stand back. By the time your done rubbing it in you'll be seeing fleas on top of your dogs coat. Thats about as far as they get before they fall over dead. Oh, your dog will be doing the heebie jeebie running around and rolling around in the grass trying to get the fleas off. Also makes your dogs coat nice and shiny. Try it, you'll never buy another flea powder.