I'm not sure that my lab actually has ringworm, she was tested at the vets and they said that she does not have a fungal infection. However, I was sick of the antibiotics that were not helping with what there best "guess" seemed to be, which was a staph infection. After reading about the product I figured I would give it a shot. I've use it once or twice a day it's truly AMAZING the spots are almost completely cleared up and the redness is gone! I love this stuff and would recommend it to anyone I met! Thanks PetAlive for such a wonderful product.