Last summer was flea city and we tried everything to get rid of them. Bug bombs, foggers, every other flea collar known to man, flew baths, exterminator, any home pest treatment you could imagine, and the only thing that worked was putting this on my pup.  Only then would they stop coming in on her. It was night and day. Unfortunately, that would be my pup's final summer with me and I'm glad she got to spend the majority of it rolling around in the back yard without having to spend hours itching afterward.