Neutered females and neutered males were more likely to be diagnosed than entire females.The risk of hypothyroidism increased as adult bodyweight increased.The risk of having hypothyroidism rose as dogs aged, with dogs aged 11-13 years at 4.54 times the risk of hypothyroidism compared with dogs aged 5-7 years.Two breeds had no recorded cases of hypothyroidism – Cavachon and Cavapoo.The most protected breeds were French Bulldog (0.27), Pug (x 0.29), Yorkshire Terrier (x 0.38), Shih-tzu (x 0.38) and Jack Russell Terrier (x 0.40).The breeds most highly predisposed to hypothyroidism were Standard Doberman Pinscher (x 17.02), Tibetan Terrier (x 11.25), Boxer (x 10.44) and Alaskan Malamute (x 9.71).The average age at first diagnosis was 7.65 years. This revealed an annual frequency of one case in 400 dogs (0.23%) for the condition, with the most common breeds diagnosed being Tibetan Terriers, Standard Doberman Pinschers and Boxers. Led by the RVC’s VetCompass Programme, researchers identified 2,105 hypothyroidism cases diagnosed amongst a study population of 905,553 UK dogs. The findings from this new study have now identified several breeds predisposed to, and protected from, hypothyroidism and will help generate increased awareness of the condition and assist with earlier detection and treatment of cases. Previous research also provided little information on which dog breeds had reduced risk of hypothyroidism. However, much of this earlier work is now dated, meaning risk factors need to be checked again for relevance to the current UK dog population. Previous research has identified several potential risk factors for hypothyroidism such as breed, neutering and aging. The condition can reduce quality of life with affected dogs often showing weight gain, lethargy, hair loss, intolerance to the cold and a tragic facial expression. Hypothyroidism, a commonly diagnosed hormonal disorder in dogs, usually occurs due to a deficiency in thyroid hormones. The findings reveal that breeds, including Standard Doberman Pinschers, Tibetan Terriers and Boxers are highly predisposed to the condition, while some other breeds such as French Bulldogs, Pugs and Yorkshire Terriers are among the breeds least likely to experience hypothyroidism. New research the Royal Veterinary College (RVC) has shed light on the dog breeds most predisposed to hypothyroidism, a life-long hormonal disorder caused by a deficiency of thyroid hormones. New research highlights dog breeds at most risk of hypothyroidismĪ new study from the Royal Veterinary College explores the frequency and risk factors for hypothyroidism in dogs in the UK, promoting greater awareness with earlier detection and treatment
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