Old dog help!

My 11 year old is dealing with yeast infections on his belly. Been to the vet 4 times in the last 2 months. Anyone else deal with these issues? Comes with ear infections also.

My 11 year old is dealing with yeast infections on his belly. Been to the vet 4 times in the last 2 months. Anyone else deal with these issues? Comes with ear infections also.