The color of the coat is considered to be brought by genetic factors and some influence in the mother's body but sometimes atavism and so on may occur, which do not always bring the same color as the parents.
毛の色は遺伝的要素や母体内での影響などが考えられているが、隔世遺伝なども起こるためか、必ずしも両親と同じ色が生まれるわけではない。