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The math within Dogs and their Height and their age, is the difference of three years. Smaller dogs live until about 16 years of age. Medium sized dogs live until they're 13 years of age. Large dogs live until they're 9/10, and Giant dogs only have a life expectancy (at least) of 7 years. However, this based on an average. Kali and I took a survey to see how old dogs are right now (As well as dogs who are deceased.)

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https://goo.gl/forms/K3wNT2h0XoTSbnop2

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American Staff Pitbull
My dog lived until she was 18 years old, was never to the vet, and ate as much dog food as she was allowed. Was as healthy as she could ever be. She developed breast cancer after her second visit to the vet.

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Weight is even more significant when considering the average dog life span. Dogs who weigh between 20-30 pounds are the longest lived on average, and the scale declines as weight increases. Dogs from 30-50 pounds have shorter life spans, those from 50-90 pounds shorter still, and the shortest-lived dogs are those whose weight exceeds 90 pounds. The difference between the smallest dogs by weight and the largest can be 10 human years.

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Figure 1. Body size and lifespan in dogs.

The relationship between body mass and lifespan across 32 different dog breeds.

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Diet- Vegetarian Diet
A border Collie that was only on a vegetarian diet lived until he was 27 years of age. Border Collies fall under the medium sized dogs category. Their lifespan being 11 years.

Spraying/Neutering- Neutered females lived longest of all dogs dying of all causes, though entire females lived longest of dogs dying of natural causes. Neutered males having the smallest lifespan in each category. Reduces pyometra (infection in the uterus) and testicular cancer in males.

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16% of deaths are Cancer related
twice as many are from heart disease.

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Only 8% of dogs lived beyond 15 years old, 64% of dogs died of diseases/euthanized as a result of the disease.

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Loss of hearing
Loss of Vision
Weight gain
Cal. intake lowers 30-40%
bladder leaks
Mental declines
Memory loss
Skin and coat changes
Decreased mobility/ arthritis
Constipation
Brittle nails
Thickened pads of paws
Changes in activity level and mood

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1 year is equal to 7 years for dogs.

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Medium/large sized dogs have a lifespan of 10-13 years.

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Giant dogs such as a Great Dane, have a life span of 7-8 years of age.

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Chihuahuas live until they're 15/20 years of age. Living longer than the average span of a small dog.

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Small dogs typically live until they're 15-16 years of age.
20 pound dogs live until they're roughly 11 years old.