Thyroid Hormone Deficiency in Dogs

Hypothyroidism is a disease of thyroid deficiency. In this condition, thyroid harmones such as T3 (liothyronine) and T4 (levothyroxine), which are essential for regulating body metabolism, are produced and released in low quantity. It is common in medium to large-sized dogs, with some being more predisposed than others. Breeds that are more prone to this disorder are Doberman pinschers, Irish setters, golden retrievers, great Danes, old English sheepdogs, dachshunds, miniature schnauzers, boxers, poodles, and cocker spaniels.

It is also more commonly diagnosed in middle-aged dogs between the ages of 4-10 years. Neutered male dogs and spayed females are found to be at higher risk than intact dogs.

Common symptoms include


Generalized weakness


Mental dullness

Unexplained weight gain

Hair loss (alopecia)

Excessive hair shedding

Poor hair growth

Dry or lusterless haircoat

Excessive scaling

Recurring skin infections

Intolerance to cold

Tilting of head to one side (uncommon)

Seizures (uncommon)

Infertility (uncommon)

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