Doesn't hurt to ask. Dogs.

Has anybody experienced ringworm on their dog? Did any otc treatments work? I just found the spot on her stomach and it explains everything else that's been going on with her for a few weeks. I'd like to try otc first before the vet. We practically live at the vet our dogs always have something going on and last time we dished out $300 and what they gave us didn't work for hot spots and an otc treatment did. Now my other dog some how contracted ringworm. Just looking for a good treatment for her and thr house.