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Misconception of Dog's 1year is equivalent to humans 7 years.

31 Jan 2011 | by derrik sarkar | Posted in: Wag Wiki

The aging profile of dogs varies according to their adult size (often determined by their breed): smaller dogs often live over 15–16 years, medium and large size dogs typically 10 to 13 years, and some giant dog breeds such as mastiffs, often only 7 to 8 years. The latter also mature slightly older than smaller breeds - giant breeds becoming adult around two years old compared to the norm of around 12–15 months for other breeds. The idea of a human year being equivalent to seven dog years is a misconception, as evidenced by the different life spans of different breeds and sizes of dogs.

Source: yeepet.com

They can be summarized into three types:

  • "Popular myth" - popular myth suggests that "one dog year equals seven human years" or the like. This is inaccurate on two scores, since the first year or two years represent some 18–25 years, and the ratio varies with size and breed.
  • "One size fits all" - suggests that the first two years equal 10.5 years each, with subsequent years equaling four human years. This is more accurate but still fails to allow for size/breed, which is a significant factor.
  • Size/breed specific calculators - which try to factor in the size or breed as well. These are the most accurate types. They typically either work by expected adult weight,[2] or by categorizing the dog as "small, medium, large".

No one formula for dog to human age conversion is scientifically agreed, although within fairly close limits they show great similarities.

As a rough approximation, the human equivalent of a one-year-old dog is between about 10 and 15 years—a one-year-old dog or cat has generally reached its full growth and is sexually mature, although it might still be lanky and need to fill in a more mature musculature, similar to human teenagers. The second year is equivalent to about another 3 to 8 years in terms of physical and mental maturity, and each year thereafter is equivalent to only about 4 or 5 human years.[3]

Emotional maturity occurs, as with humans, over an extended period of time and in stages. As in other areas, development of giant breeds is slightly delayed compared to other breeds, and, as with humans, there is a difference between adulthood and full maturity (compare humans age 20 and age 40 for example). In all but large breeds, socio-sexual interest arises around 6–9 months, becoming emotionally adult around 15–18 months, and full maturity around 3–4 years, although as with humans learning and refinement continues thereafter.

According to the UC Davis Book of Dogs, small-breed dogs (such as small terriers) then become geriatric at about 11 years; medium-breed dogs (such as larger spaniels) at 10 years; large-breed dogs (such as German Shepherd Dogs) at 8 years; and giant-breed dogs (such as Great Danes) at 7 years.[4]

complete detail: http://en.wikipedia.org/wiki/Aging_in_dogs

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