| http://www.w3.org/ns/prov#value | - Check out: http://www.vet.cornell.edu/consultant/Consult.asp Hyperpigmentation gives a long list of potential problems, but given your dogs history, I would definitely say some sort of allergen - most likely food if there is no seasonality to the problem, though depending on where you live and what sort of allergens you may have floating around the house (carpeting, dust mites, etc.) it is possible
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