Just like humans most mammals are thyroid deficient as they get older. Ive talked with vets who know more about t3 and rt3 than supposed MDs. Currently have a terrier and Bengal cat in their later years. Have both on t4, Cats when older start loosing their hair and people think its fleas, or ticks. Older dogs are also prone to early morning hacking caused by angiotensin, and benefit from adjusted doses of an ACE2 inhibitor. (losartan). Have 2 of those.
