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 t three weeks, the puppy's nervous system is undergoing rapid development. His eyes and ears open, and baby teeth appear. He begins to stand up and by three weeks will try to explore his environment. He begins to interact with littermates and the pups will start to play chasing and pouncing games with each other
By 21 days the puppies are able to lap food from a bowl, though they continue to nurse.
The puppy starts reacting to sound. The mother will begin disciplining the pups with a low growl when necessary.
The puppy learns to relate to its littermates as pack members. The mother teaches her puppies canine body language, which he will need the rest of his life.
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