The inclination of canines to seek repose in the space between a human’s legs is a common behavior with roots in instinct, comfort, and social bonding. This positioning offers the dog a sense of security, warmth, and proximity to its pack leader, which in this case is the human companion. For instance, a small breed might find protection from larger animals or environmental elements in this enclosed space.
This behavior provides benefits to both the animal and, potentially, the human. For the dog, the close physical contact promotes feelings of safety and reduces anxiety. It can also provide a consistent source of body heat, particularly beneficial for smaller breeds or dogs with thin coats. Historically, such close sleeping arrangements would have offered survival advantages in the wild, enabling pack members to share warmth and detect threats more effectively.