An Epidemiological Study on Tumors in 5, 819 Dogs

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  • 犬の腫瘍5, 819例の疫学的分析
  • イヌ ノ シュヨウ 5 819レイ ノ エキガクテキ ブンセキ

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The purpose of this study was to document the incidence of canine tumors in Japan. During the period April 1985 to March 2006, 26, 072 dogs were referred to the Azabu University Veterinary Teaching Hospital. Of this number, 5, 819 dogs were diagnosed with a tumor. The 5, 819 canine neoplasm cases were analyzed by age, sex, malignant tumor rate, breed and site-specific tumor incidence. The average age of dogs with tumors was 9.2±3.3 years old.Cases with tumors were significantly older than general clinicalcases (6.1 ± 4.2 years) in dogs. The gender ratio was male 1: female 1.45, with female dogs showing asignificantly higher incidence than male dogs. The odds ratio, which reflects tumor incidence, washigher for Golden Retrievers (1.5) and Shetland Sheep Dogs (1.4), and significantly lowerfor Miniature Pinschers and Cavaliers. From the analysis of tumor incidence, malignancy rate, age, sex and canine breed for each specific site, we were able to confirm the statistical significance for each factor. Japanese canine breeds such as Shiba-inu and Kai-ken showed a significantly higher incidence of skin tumors, which included mast cell tumors. The odds ratio in Collies, Cocker Spaniels and Golden Retrievers for lymphoma was remarkably high in comparison with American reports. It was concluded that these results were useful clinical indicators for the diagnosis and treatment of canine tumors.

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