Hypothyroidism and Aggressive Behavior In Dogs
Aggressive Behavior & The Thyroid
Hypothyroidism is a common condition in dogs and is caused by an underactive thyroid gland that doesn't produce enough thyroid hormone.
Symptoms of Hypothyroidism may include:
weight gain, even after reducing food/calories
skin conditions, fur loss, especially hair loss on tails
chronic ear infections
depression
lethargy
auto-immune disorder: lymphocytic thyroiditis
Aggression: especially sudden onset
Causes of Hypothyroidism
Genetics can play a big role in this disease, hence the list of breeds this issues often present itself in. But it may also be caused by poor nutrition / processed foods or vaccine reactions contributing to a weakened immune system.
Another consideration is damage to the thyroid gland by improper collar usage. We often think of trachea issues, especially in a small dog when wearing a collar, but dogs of any size can cause unnecessary trauma to the thyroid by constantly pulling on a leash. The more they pull the more risk of injury to not only the trachea but the thyroid too. You know me, I’m all about training for good behavior — but some of you may need new training tools if you cannot quickly get your dog under control from pulling.
Hypothyroidism can occur in any breed, though some breeds are more predisposed to developing the condition than others. Some of the breeds that are more likely to develop hypothyroidism include:
Golden Retrievers
Doberman Pinschers
Dachshunds
Cocker Spaniels
Boxers
Irish Setters
Great Danes
Beagles
Greyhounds
Miniature Schnauzers
Bulldogs
Other factors, such as age, sex, and overall health, can also influence the risk of developing hypothyroidism.
I have seen hypothyroidism and behavioral aggression most often associated with male dogs as they reach maturity. So in each of my male behavioral cases, we want you to have a full Thyroid workup. Ideally, we’ll do it for all, I just a little more insistent on the males, especially intact males.
You will need to see a veterinarian for a complete blood work-up that includes testing the thyroid. You will want a complete Thyroid Panel not just T4. T4, Free T4, T3, Free T3, & Thyroid Antibodies.
While there are foods that are high in iodine and supplements, it’ s not as simple as adding more to the bowl. In fact, if you simply add more iodine-rich foods you could move too far and create hyperthyroidism. Monitoring your dog’s condition with veterinary care is essential.