My dog has had the same smelly, red areas on her belly. Then eventually her hair started to fall out. Since then she has been put on cyclosporin, a human medicine to prevent rejection to people with organ transplants. She has gotten much better, but I also have to bathe her 2 time/week. She is getting there. skin infections are very common in Boston's. Good luck!
Hi, I was just wondering if the rash your terrier has - has an odor? If it does, I'm going through the same thing with my dogs. The vet called it a "yeast infection" of the skin. It also makes the hair eventually fall out. Sound familiar? If so, I can tell you what the vet told us to do.