Veterinarians are aware of an even more startling set of figures. After female dogs reach ten months of age, they become fertile and remain so for an average of six years. During this time they may bear an average of four pups per year. Within six years, a single female dog can produce 67,000 descendants.
獸醫界的另一個數字更驚人，對十個月就有繁殖能力的狗兒，在理論上，假設平均一隻狗有六年壽命、每隻母犬每年成功養活四隻小狗，一隻母狗六年內便可繁衍出六萬七千隻狗子狗孫。