Some studies on cranial lengths of the Japanese raccoon dogs showed that male skulls and mandibles were slightly longer than female ones, while other studies concluded that there was no difference. Studies on Finnish and Korean raccoon dogs also concluded that there was no difference. Measurements of other bones and body weight have not been reported. We studied the skull length, mandible length, and femur length of 118 raccoon dogs (61 males, 57 females) in Wakayama, western Japan, and found that male bones were slightly longer, but the difference was only within 2%. However, there was a significant difference in body weight, with males being 22.3% heavier than females in summer and autumn.
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