Abstract
By the time most puppies reach adulthood, they will have increased their birth weight by 40 to 50 times. However, as there is a great variation in dog size, from tiny Chihuahuas at around 2 kg to Irish Wolfhounds at around 70 kg bodyweight, growth periods vary. Small breed dogs generally reach adult body size at between 9 and 12 months of age, and large and giant breeds not until they are 18–24 months old. If one considers that an adult giant breed dog may weigh the same as an adult human, who would take 18 years to reach maturity, this is a remarkably rapid growth period!
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