There are obvious differences in body and personality: among dogs of the same breed, male dogs are larger and eat better than female dogs, while female dogs are relatively smaller than male dogs; male dogs have a strong sense of occupation and a very strong personality. Fierce, female dogs are gentler and can get along peacefully with other pets. Furthermore, male dogs have reproductive functions, and female dogs have reproductive and production capabilities. If breeders want lively dogs, they can choose male dogs, and if they want dogs to be quiet, they can choose female dogs.