I don't know if yorkies are "prone" or not, but I do know that older dogs, including yorkies get a lot of skin things that thankfully are mostly benign. My 14 year old has a few areas of very small skin tumors and my vet was calling them "warts" but in fact when they were biopsied, they were diagnosed as being sebaceous hyperplasia (a benign tumor of the sebaceous gland of the skin).
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