He has no real symptoms other than the smell and the oily look to his fur. If I let him go he might develop them I suppose. His feet don't smell like anything but dirty toes. Ick. He has nothing obvious like hot spots and isn't even more itchy than a normal dog.
He needs to go to the vet I guess. I'm broke at the moment as my new rescue (a GSD) has cost me about $2,000 to date and is still needing more vetting. I was hoping it was something common with Yorkies and there would be a simple solution. I should know better. I never rescue anyone cheap. LOL
Thanks for the responses everyone.