Hypothyroidism may also lead to reproductive difficulty, although it does not always affect reproductive success. Bitches who repeatedly fail to catch should probably be checked, as treatment can lead to resolution of the problem. It is, however, also important to remember that hypothyroidism is considered to be a heritable condition, which should be factored into breeding decisions. Diagnosis of hypothyroidism is not difficult. Clinical signs and physical exam findings will often suggest thyroid testing.
Many different protocols are available.
Some of the newer in-house tests are useful, but have limitations. The recent International Seminar on Canine Hypothyroidism recommended the following thyroid panel. OFA registry also requires specific tests. This panel is easily available. The MSU screen also measures free and available T3, which can be useful in certain cases.