"Newborn pups are uniquely different from adults in several respects. When born, their eyes are closed and their digestive system has a limited capacity requiring periodic stimulation by their dam who routinely licks them in order to promote digestion. At this age they are only able to smell, suck, and crawl. Body temperature is maintained by snuggling close to their mother or by crawling into piles with other littermates. During these first few weeks of immobility, researchers noted that these immature and under-developed canines are sensitive to a restricted class of stimuli which includes thermal and tactile stimulation, motion and locomotion."
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