How fast do dogs grow


In 2004, the growth rate of dogs, as well as the body-weight changes during the growth period, was studied in 173 puppies that represented 12 different breeds. The study was published in the 2004 issue of the Journal of Nutrition by the American Society for Nutrition.

The breeds that were in the study were the English Mastiff, St. Bernard, Irish Wolfhound, Great Dane, Newfoundland, Labrador Retriever, Beagle, English Springer Spaniel, Cocker Spaniel, Miniature Schnauzer, Cairn Terrier and Papillon. The puppies were observed for a period of 12 months for small to medium-sized dogs, and 18 months for large breeds.

It was observed in the study that toy dogs experienced growth spurts until 11 weeks after birth, small to medium-sized dogs until 14 to 16 weeks and large breed dogs up to 5 months. The increase of body weight during this spurts on average was between 13 to 17 percent per week.

In the study, toy dogs and small and medium sized dog breeds were able to achieve 99 percent of their growth at around 9 to 10 months. Large dog breeds reached 99 percent of their adult weight at 11 to 15 months.

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