Big flea problem

I've always been told you can use cat flea powder because cat are always licking themselves and it's safe on them so it's safe on other animals I would think. I have used it on sheep lambs. Just an opinion.

I believe It's called premethine or close to that we spray our yard every year and give our dogs a bath with it. It is huge in killing most pest from flies to tics etc... I know some farmers spray there deer pens with it. It is very dangerous to cats and deadly to fish. Just an idea you could check with your vet?