My poor yorkipoo is balding on one side. What could be causing this?

[Laurie]

Could be food allergies. Find a food without any wheat, corn or soy. I feed mine Nutro for small dogs mixed with canned Wellness Core. I adopted her and she had thin hair. Now it is becoming fuller and healthier looking after only a month..
Another thing to look at is if she is rubbing herself up against something. Is she in a kennel and trying to get out? This could cause the balding. The vet can do some skin tests to see if she has a dermatitis. Let them know if she is chewing or licking the area excessively. Do not over bathe her as this can cause skin problems too. I just asked about the proper shampoo for my Yorkie mix that I adopted a month ago. I will not give her baths often because she is a house dog and will just need her daily brushing.