What is Hypothyroidism in Dogs

Hypothyroidism in dogs is a condition caused by insufficient production of thyroid hormone due to underactive thyroid glands. The most common cause is the pet's own immune system attacking the thyroid gland or the replacement of thyroid tissue with fatty tissue. Other potential causes include cancer or a defect from birth.




Written by Dr. Mariella Roberts, Veterinary Surgeon, Animal Trust Vets CIC | Published January 2025 | Review date January 2027 | This advice is for UK pets only and is not a replacement for seeing a vet