Our 11 year Shih Tzu is blind from cataracts. At 3 he became very ill from something unknown. He was hypercalcemic, lost weight, and lost his hair. After many tests and much cost, nothing was ever diagnosed and he improved. Since then he has never seemed very healthy. The vet recently did more blood and urine tests and they came out normal. She did note that he has lost his front teeth, needs teeth cleaning, and has some black spots on his gums that could be melanoma. They want to do a teeth cleaning, possible extraction, and biopsy. This will all cost around $500. We aren't sure this is worth the cost at this time. If he does have melanoma, the prognosis isn't good, so we would have wasted all the money of the teeth cleaning, etc.