Is hypothyroidism in dogs a heriditary problem?

I am researching Giant Schnauzer breeders and found that some test for thyroid. My last giant schnauzer had hypothyrodism. I know that largerer breeds are more susceptible. Is hypothyroidism a heriditary problem?

  • Vetinfo

    By: Erin Broersma El Segundo, CA

    Replied on 04/19/2011

    Hypothyroidism can be considered a hereditary problem, although unless parental testing is done, you would not know for sure if the puppy is predisposed. Even if genetic testing reveals that the parents do not have the markers for hypothyroidism, some large breeds prone to developing the condition may still develop a thyroid that does not work as well as it should. Before you allow a breeder to guarantee that the puppy will not develop this condition, I would ask to see the results. Also notable, hypothyroidism does not show up until middle age for a dog. I would assume the breeder would be unable to provide any life-long guarantee that this condition will never arise, because it will not always be a genetic issue.

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