Here's why:
* Communication: Barking is a natural form of communication for dogs. They use it to express a range of emotions, including excitement, fear, hunger, and pain.
* Development: By 3-4 weeks, puppies are developing their vocal cords and learning to use them.
* Socialization: They start practicing barking to interact with their littermates and mother.
While they might start barking early on, puppies' barks will evolve as they grow.
Important Note: If you're concerned about your puppy's barking, it's always best to consult with your veterinarian or a professional dog trainer. They can help you identify the reason behind the barking and provide guidance on how to manage it.