I would not purchase or bring into your home any animal prior to a full veterinary exam. People don't want to pay a vet for a "normal animal/puppy" but we can end up saving them hundreds by finding the problem before it is in your house.
For example, this may just be bacterial, but it can be fungal like ringworm and contaminate you, your family, and your animals...and house.
It can be a noncontagious for of mange that is immunerelated so the animal goes on medications for 3 months and you run the risk of outbreaks, plus this is not a dog to be bred.
So...I would make the appointment first, I promise it is well worth the $ up front!
Dr.V
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Dr. D.A. Vamvakias
Veterinarian