Cats:

The lack of sufficient thyroid hormone in cats might lead to weight gain, lethargy, cold intolerance, poor coat condition and a poor sign of interest. Blood tests are required to see if your cat has a thyroid problem. Treatments are normally successful within 30 days and will improve your cats appearance and demeanor significantly. The vet will most likely order a follow-up test within a month to determine how much the hormone levels have stabilized. Most likely your animal will be on thyroid medication for as long as it lives.

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