It may be related to innate instincts and habits. Dogs learn many behaviors as puppies through interaction with their mother, one of which is sucking milk. During this process, the puppies will bite tightly on the mother's nipples and obtain nutrients through sucking. This behavior forms a deep memory and habit in the puppy's brain, and even when they grow up, they will still retain this sucking behavior.

In addition, dogs like to bite quilts, which may also be related to their oral stimulation needs. Dogs have an innate desire to explore the world, and their mouths are one of their most direct tools for exploration. By biting quilts or other items, dogs can satisfy their oral stimulation needs, while also helping them relieve discomfort such as tooth itch.