For some reason the fleas have been really bad this year in my area. Louis has been on Frontline, but it is not working. I have also bathed him in Dawn dish soap. The vet recommended that I keep using the frontline once a month and also suggested that I use Capstar. Is this safe to use on him? Also, what kind of safe spray can I use in my yard. I never see the fleas in my house. I have only seen a few on Louis, but he is scratching like crazy. Please help! It is driving him crazy and his hair is a mess from the constant scratching!