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  • Puppies’ Amazing
        Rate of Growth
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    Neonatal Period (0-13 days)
    Transitional Period (14-20 days)
    Socialization Period (21 days - 4 weeks)
    Juvenile Period (4 weeks - 6 months)
       

    Human and dogs are in two different biology systems. Know better the puppy growth is help to understand the physically and mentality evolution of a dog.

    Birth
    Neonatal period begins. Puppies, born with their eyes and ears sealed shut, are completely dependent on their mothers. Body temperature is about 97 degrees, and the body consists of about 84 percent water.

    Day 2
    The heart rate often has more than 200 beats per minute. When puppies are picked up, they curve into a comma shape, reflecting an immature nervous system. Reflex urination and defecation are present; they can't eliminate unless the mother stimulates their urethra and anus with her licking

    Day 5
    The nervous system is developing quickly. Puppies picked up today will arch their backs and stretch their limbs rather than curving into a comma.

    Day 7
    Precocious pups begin to crawl

    Day 10
    The nervous system is mature enough to accept sights and sounds from outside. The eyes and ears begin to open.

    Day 14
    Neonatal period ends and transitional period begins. All pups should have open eyes and ears by now. Some will have their first incisor teeth erupting. All puppies should be crawling.

    Day 16
    Puppies begin to walk, unsteadily at first

    Day 18
    Puppies urinate and defecate on their own. They usually will do so in the whelping box.

    Day 21
    Transitional period ends and socialization period begins. Siblings enjoy more social interaction. Puppies begin active exploration of the nest. Some may even crawl out of the whelping box to explore the world. Pups can walk strongly with an adult like gait.

    Week 4
    Puppies can carry toys, fight and tug at visitors' shoelaces. They can eat soft foods to supplement mother's milk. They are fearless explorers. The average body temperature has reached a steady 100 degrees, and the average heart beat rate is about 173 beats per minute. Most puppies have their incisor teeth; some may have a full set of puppy teeth.

    Week 6
    Puppies have learned proper adult greetings – sniffing nose and tails. They begin adult-type play behavior, including dominance rolls and mouthing of litter mates.

    Week 12
    Socialization period ends and juvenile period begins. Puppies are learning cause and effect but are becoming more fearful of unpleasant consequences of their acts, such as being scratched by a cat when they try to greet it. Trauma at this time can cause them to lose socialization skills. Body temperature maintains at adult temperature – 101.5 degrees. All puppy teeth should be in by now.

    Week 16
    Puppies often begin losing puppy teeth and replacing them with adult teeth, starting with the incisors.

    6 months
    Pediatric period ends. Most internal body systems are nearly adult. Except for a still-growing skeleton and higher caloric needs, the puppy is very much a small adult. The body now is only about 63% water, and its heart beat rate may be as low as 70 beats per minute. By the end of month 6, the puppy should have a full set of adult teeth.

    Data Source: Joanne Healey Howl, DVM

     
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