Here's why:
* Socialization: Puppies learn essential social skills like bite inhibition and appropriate play from their littermates and mother during this time.
* Nursing: Puppies receive crucial antibodies and nutrients from their mother's milk, which they need for healthy development.
* Weaning: Gradual weaning from their mother's milk helps puppies transition to solid food.
* Physical Development: Puppies are still developing physically and need time to build strength and coordination.
Important Note: There are exceptions to this rule. Some puppies may need to be separated from their litter earlier due to health or other special circumstances. However, this should only be done under the guidance of a veterinarian or experienced breeder.