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Distribution of the age at the time of diagnosis of tumor cases classified by sex. The age of the dogs diagnosed as tumor cases at the time of the examination request is shown in the graph classified by sex. Analysis of age of the samples by pathological classification revealed that the mean age of developing tumors in male dogs was 10.4 ± 3.0 years (mean ± S.D.) and that in female dogs was 10.4 ± 2.8 (mean ± S.D.), showing no significant difference in the age between males and females.
