狗狗每平方厘米的皮肤上大约有1000-9000根毛发,一些品种的狗狗(哈士奇、阿拉斯加和许多寻回犬等)有一层光滑的外层毛发和一层细柔的内层毛发,每年还会经历两次季节性脱毛(春末和秋末),在此期间,大部分内层毛发会成团脱落。但许多短毛品种的狗狗没有内层的细毛,而且这些品种的狗狗全年都在经常性地脱毛。
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