I have the same problem with my Schnauzer. he is chewing on her feet and scratching. I get her groomed every 4 weeks and also she doesn't have any corn in her food as I was told when I purchased her that would be a problem. Was there some other way or something I could put on her like Gold Bond powder. I have taken her to the vet and have a medicine to put on if I can find where the problem is but can't visually see anything. Any sduggestions would be helpful.