Hypothyroidism is the most common endocrine disorder  in dogs, occurring when the thyroid gland fails to produce enough hormones , leading to a slowed metabolic rate . While it can affect any dog, it is more frequently found in older dogs  and those that have been spayed or neutered . In some cases, autoimmune reactions  cause the immune system to attack the thyroid gland , often triggered by leaky gut , which leads to an extreme immune response. This condition is known as au