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Beautiful Pup Wallpaper Graphics HD Backgrounds Free!
A puppy is a juvenile dog. Some puppies can weigh 1–3 lb while larger ones can weigh up to 15–23 lb. All healthy puppies grow quickly after birth. A puppy's coat color may change as the puppy grows older as is commonly seen in breeds such as the Yorkshire Terrier. In vernacular English puppy refers specifically to dogs while pup may often be used for other mammals such as seals giraffes guinea pigs or even rats.
Born after an average of 63 days of gestation puppies emerge in an amnion that is bitten off and eaten by the mother dog. Puppies begin to nurse almost immediately. If the litter exceeds six puppies particularly if one or more are obvious runts human intervention in hand-feeding the stronger is necessary to ensure that the runts get proper nourishment and attention from the mother. As they reach one month of age puppies are gradually weaned and begin to eat solid food. The mother may regurgitate partially digested food or might let them eat some of her solid food. The mother dog usually refuses to nurse at this stage though she might let them occasionally nurse for comfort.
At first, puppies spend the large majority of their time sleeping and the rest feeding. They instinctively pile together into a heap and become distressed if separated from physical contact with their littermates, by even a short distance.
Puppies are born with a fully functional sense of smell but can't open their eyes. During their first two weeks a puppy's senses all develop rapidly. During this stage the nose is the primary sense organ used to find their mother's teats and to locate their littermates if they become separated by a short distance. Puppies open their eyes about nine to eleven days following birth. At first, their retinas are poorly developed and their vision is poor. Puppies are not able to see as well as adult dogs. In addition, pup ears remain sealed until about thirteen to seventeen days after birth after which they respond more actively to sounds. Between two and four weeks old pup usually begin to growl bite wag their tails and bark.
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