This post deals with Canine Hypothyroidism because except in a
few very extreme circumstances Feline Hypothyroidism does not
exist. The thyroid gland is a small gland in the neck adjacent
to the windpipe. It is considered a master gland and is
responsible for producing thyroid hormones which have an effect
on many parts of the body, including the skin and hair coat,
metabolism, behaviour, attitude and even bone marrow function.
Hypothyroidism occurs when the gland does not produce enough
thyroid hormone.This deficiency is can be caused by immune-
mediated destruction of the thyroid gland, by natural atrophy of
the gland, by dietary iodine deficiency, or as a congenital
problem. In dogs, the first two causes listed account for almost
all cases. Hypothyroidism generally develops in middle aged or
elderly dogs. Breeds with definite predisposition to develop
hypothyroidism include: the Doberman pinscher, the Golden
retriever and Labrador Retriever, the Irish Setter, the Great
Dane, the Dachshund, the Boxer, and th