I have two yorkies, brother and sister, who are 9 years old and they each lost their hair, one at age 3 and the othr age 4. The vet checked for yeast and found none and said they needed to go to a dermatologist pet doctor. I just can't affor that. I've tried no beef food, supplements to their food, medicated shampoos, and made my own food for them. One dog has some hair now but it is completely off under her chin on next and underside of body. The other is completely bald and has hot spots on his skin. I can't hold them because their skin is sticky and scaly. Does anyone have any ideas on what to do. Thanks,