I want to treat my yard for fleas, but I don't want a bunch of chemicals sprayed everywhere for my dog to breathe, walk in, or play in. Does anyone know of an effective, safe flea treatment for the yard? I use Ivermectin for fleas, and it is very effective, but it only works AFTER the flea has bitten the dog. the dog still suffers from the flea bite. I also have him on garlic, which makes the fleas stay away in the first place, but I just want to be sure.