This is a fab product, it really does work. We did not have bite marks on us, but the cats were scratching so treated the cats but wanted to make sure there weren't any in the house. I put this item out and caught my first flea on the second day!! I was not sure if I should be really excited or disgusted, lol!! I couldn't see any on the carpet, but on the third day it had caught seven. So in my books it worked brilliantly and caught the fleas before they could do any real damage and no harsh chemicals in sight.