This is generally normal, because melanin will be deposited on the dog’s balls during development, so when we observe its balls when it is an adult, we will find that it is black. Of course, if the dog’s balls have skin Disease or wound infection will also cause black precipitate after recovery. As long as the dog's health is not affected, parents do not need to worry too much.

Tip:

A dog’s prolonged estrus will increase the risk of disease infection. Parents should sterilize their dogs as soon as possible to prevent them from contracting diseases.