Though using their mouths on our hands, arms, legs, hair and clothes is natural behavior for dogs, they must learn to interact in ways that are appropriate in our world. Karen B. London, PhD
The degree to which dogs learn not to use the full force of their mouths on people and other dogs is called “bite inhibition,” and it is the most important part of a dog’s education.
Source: The Bark, January 2022. Link. Proper bite inhibition is incredibly important, and developing it requires lessons early in life. Both genetics and learning influence the process. The normal process of learning bite inhibition is linked with puppy development and it is unlikely to be learned later in life with the same degree of success.