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Q.  A 20-year-old female pony is presented for evaluation in June in North America. She has not shed out much this spring, is very overweight, and was reluctant to move after the spring grass came in. What is the most likely diagnosis?
  1. Primary hyperadrenocorticism
  2. Pituitary pars intermedia dysfunction
  3. Hypothyroidism
  4. Diabetes mellitus type 1
  5. Congenital hypertrichosis of Dartmoor ponies