Critical periods in puppy development: 21-49 days
Puppy playtime is more than just puppy fun time. Between 4-16 weeks of age, play is also critical period of learning. During this time...
Critical periods in puppy development: 21-49 days
Puppy's first three weeks
Can newborn puppies hear?
When can newborn puppies see?
Hello World! Mom prepares for her puppies