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Originally Posted by Ladymom  As everyone else has said, he needs to be seen by your vet. Make sure he has a geriatric physical with bloodwork. That should include a thyroid panel, but double check.
Thyroid imbalances cause hair loss and are very common in older dogs. Lady's been on thyroid medication for many years. It's a very easy and inexpensive condition to treat. |
I would second the Thyroid. My Beans, just started to show hair thinning and I'm going to have the same done. He's three this March.