I was just speaking with a friend who's finding the flea problem on his dog. He's following his vet's instructions, but the dog still has fleas - and the medication seems to make her lethargic. I used a premise spray once, years ago, and haven't had a problem since. Even my grey boys, my outdoor cats, don't have fleas. I think the premise spray made the difference. Can anyone recommend a good premise spray that wouldn't be expensive? The one I used is no longer made. I'd like to help my friend if I can. Thanks!