Yeast infection inside of paws

My 14 year old American Bulldog foster dog has the worst skin problems. He came to me with an awful skin infection all over his neck and belly. It was like a fungus and something else. His skin was wrinkly, scaly, and hard. It made his nipples swell up so bad they looked as if they would fall off. It was not mange, I just can't remember exactly what it was called. He is constantly itchy, has runny eyes, and can't stand to be wet, not even a drop. I keep his bedding and feet clean and he only goes outside to potty or for walks. He has been licking and chewing at his paws even when he's given Benadryl. After close inspection I noticed a yellow flaky looking growth on the skin inside of his paws which is a yeast infection. I've dipped his feet in an apple cider vinegar mixture as directed, I've gotten special wipes, I've given him yeast infection medicine but nothing seems to make it better. Any other home remedies out there?