This condition is thankfully very rare in dogs

Hyperthyroidism is usually caused by an excessive production of thyroxine brought on by aggressive thyroid cancer.

Another source of raised thyroid hormones is from hypothyroid medication, which usually includes a synthetic form of thyroxine. An over-correction of low thyroxine levels can sometimes result in hyperthyroidism.

Raw food diets that include an excessive amount of thyroid hormones can also cause the condition. These diets often include gullets, head meat, and animal necks, which contain higher levels of thyroid hormones.Coat may become patchy with increased shedding.

Signs & Symptoms of Hyperthyroidism

Coat may become patchy with increased shedding.

Increased appetite

Excessive Weight Loss (despite increased appetite)

Increased thirst (Polydipsia)  &  urination (Polyuria)

Excitability

Anxiety

Lump in the neck – the enlarged Thyroid gland

Vomiting

Diarrhoea

Depression

Weakness

Difficulty in breathing (Dyspnea)

Irregular heartbeat

Intolerance of the cold.

1http://m.petmd.com/dog/conditions/endocrine/c_dg_hyperthyroidism

2http://www.natural-wonder-pets.com/thyroid-stimulating-herbs-for-dogs.html

3http://dogtime.com/dog-health/53833-hyperthyroidism-dogs-symptoms-causes-treatments#tDWCgd4FiqD86IcE.99

4http://dogtime.com/dog-health/53833-hyperthyroidism-dogs-symptoms-causes-treatments#tDWCgd4FiqD86IcE.99

5http://www.msdvetmanual.com/endocrine-system/the-thyroid-gland/hyperthyroidism

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