Hyperthyroidism in dogs caused by consumption of thyroid-containing head meat

Area of Science:

• Veterinary Medicine
• Endocrinology
• Animal Nutrition

Background:

• Hyperthyroidism in dogs is uncommon and typically associated with thyroid tumors.
• Clinical signs and laboratory values in two dogs suggested hyperthyroidism, but thyroid gland size was unexpectedly small.

Observation:

• Sonography revealed small thyroid glands in both affected dogs.
• Investigation into the dogs' diet identified head meat from a specific supplier as a potential source of thyroid hormone exposure.

Findings:

• Analysis confirmed the presence of thyroid gland tissue in the head meat.
• Elevated iodine concentrations and hormone measurements in other dogs fed the same meat supported the diagnosis of alimentary hyperthyroidism.
• Thyroxine levels decreased and clinical signs resolved after the dogs' diet was changed.

Implications:

• This case highlights alimentary hyperthyroidism as a potential diagnosis in dogs with hyperthyroid signs.
• Dietary sources, specifically contaminated meat products, can contribute to endocrine disorders in animals.
• Careful dietary assessment and supplier verification are crucial for managing and preventing such conditions.