"Cats three dogs four" is a folk saying. The pinyin is māo sān gǒu sì, which means that the gestation period of cats is three months and that of dogs is four months, but one day for a human is equivalent to two days for a cat or a dog. Days, days and nights are calculated as two days. In this way, cats last about one and a half months, and dogs last about two months.

Generally, the pregnancy period of cats is 58 days to 71 days, and the pregnancy period of dogs is 58 days to 68 days. days, the average is 65 days, about two months, it is not a big problem if it fluctuates by one or two days depending on different circumstances.