Most dog owners and veterinarians know that small dogs live longer than large ones, but until now there has been no thorough systematic examination of breed-related causes of death.
大多数养狗狗的人和兽医都知道体型小的比体型大的狗狗寿命要长，但直到现在仍没有一个彻底的系统性检查来说明狗狗的死因和品种的关系。
Most dog owners and veterinarians know that small dogs live longer than large ones, but until now there has been no thorough systematic examination of breed-related causes of death.
大多数养狗狗的人和兽医都知道体型小的比体型大的狗狗寿命要长，但直到现在仍没有一个彻底的系统性检查来说明狗狗的死因和品种的关系。
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