Steve Bloomington, Indiana 3/3/2015 6:22:49 AM I don't know what chemicals are in Dawn dish soap. I do know that animal rescue people use Dawn on the animals they receive. Have you ever read the label on a dog shampoo? If you want to stay away from chemicals you best use a natural soap with words you can pronounce. If you are fighting fleas here is a good article for naturally eliminating fleas http://inhomedogtrainingvideos. com/6-steps-to-get-rid-of-those-doggone-fleas/.