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Puppies are born smelling first (nose open), then their eyes open around 12-15 days of age. The retina matures around 21 days of age and the puppy should see clearly by 4 weeks of age.  

The ears open around 14-17 days of age, and they should hear clearly by 4 weeks of age.

Newborn puppies are able to maintain a body temperature about 12
 
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