[theBCnut]

Ringworm can be an immune issue so feed to support the immune system. That means a high quality protein diet plus antioxidants plus probiotics. Since schnauzers can be prone to pancreatitis, you may be watching his fat levels, so it may be that it would easier to add some low fat meat to his diet than to switch foods, if he isn’t already on a high protein diet. Don’t add more that 20% of his food in meat.