A simple blood test can diagnose hypothyroidism in dogs, and most dogs suffering from this disease can be treated with a synthetic thyroid medication. (professorshouse.com)
Since it can be tricky finding a physician who can test and diagnose hypothyroidism correctly, I've included a link for your convenience. (carbscout.com)
There are a number of blood tests available to help diagnose hypothyroidism. (fcrsa.org)