Help Needed! Sarcoptic Mange

[KelseyandAtticus]

Atticus had his second dose of ivermectin Tuesday. He is still doing so well. He still has a couple of thin spots on his hind legs where the mange was worst, but besides a few scabs you can barely tell he's the same dog as two weeks ago. The past few days he's scratched a little, and he had a few spots on his tummy Wednesday after his medicine. Unfortunately, he has chewed his leg today until it was a little bloody. I was wondering if he was chewing his scabs off, or is he breaking out again? I hate to run to the vet considering he as one more dose next Tuesday. Does anyone have an opinion or some advice?