[Ellie May]

The vet would know if this is yeast or not if they looked under the microscope. An infection of this magnitude most likely will not clear with a topical antifungal.

If the food is causing this he does need to be switched. I understand..Ellie can only eat one food..but it may be necessary.

I don't want to get into my personal opinions of probiotics and coconut oil, just remember if it sounds too good to be true...Probiotics cause stomach upset in some dogs. And adding additional fat to a Yorkie's diet, even if coconut oil, is not always indicated. I think you should talk to a veterinary nutritionist.