| The life expectancy of any dog is commonly | | | | to develop advance muscular features as they grow |
| expressed in terms of dog years by us and it | | | | along with a similar mental development. Through a |
| depends entirely on the dog's breed, size as well as | | | | major dog study, it has been estimated for dogs of |
| the dog's surroundings. Various other factors affect | | | | all breeds and sizes that, nearly "64 percent of dogs" |
| the life expectancy of a dog. A dog's life span | | | | were euthanized because they were affected with |
| changes according to the diet provided to him and | | | | some kind of diseases. Only 8 percent of the total |
| also by the number of medical problems the dog | | | | dogs live beyond 15 years and nearly 16 percent of |
| tends to face over the years. | | | | them die yearly due heart diseases and cancer. |
| The average life span of the small dog like Chihuahua | | | | Human lives are not terminated even if they suffer |
| is about 15 to 16 years, while medium sized the dogs | | | | from rare and incurable diseases; and this is the main |
| like Border Collies have a life span of 10 to 13 years. | | | | reason why the lifespan of an average human being |
| It can be noticed big dogs like Great Dean live up to | | | | is reasonably long. |
| only 7 to 8 years. The calculation of the life | | | | The effects of aging in dogs is said to be dormant |
| expectancy of particular dog can be accurately done | | | | for several years. But like humans, dogs to undergo |
| with the help of "size or the specific breed calculator", | | | | physical changes as well. The first sign of aging in |
| which is said to be one of the most accurate age | | | | dogs is said to be the decrease in its activity levels. |
| measurement schemes available. The size or specific | | | | The sleeping period in these dogs also becomes |
| breed calculator gives approximate results about the | | | | longer. The canines experience a drastic change in |
| dog's predictable lifespan based on the size as well as | | | | their skin condition, limb usage, appetite and they |
| the breed of the dog. | | | | experience tooth loss as well. Their sense of hearing |
| It is generally assumed that, on an average, "one | | | | and vision also diminishes gradually. Older dogs tend |
| human year equals to seven dog years". This | | | | to experience stiffness in their body. All these |
| statement may not be appropriate, since the first | | | | obvious signs of aging can even be found in humans. |
| two years are jointly represented by 18-25 years in | | | | The human years are extended only because of |
| such schemes and because the entire ratio cannot be | | | | advance modern medicine and various other drugs |
| generalized for all the dogs though, they belong to | | | | that are designed to deal with symptoms of old age. |
| different sizes and breeds. An exact ratio of dog | | | | Dogs and humans may not have the same |
| years vs. human year cannot be formulated. | | | | physiology, yet some obvious similarities can be |
| However, some obvious features remain similar | | | | noticed when both species age. Dog years and |
| between both aging humans and dogs. | | | | Human years may not be directly related by some |
| It is generally assumed that the human equivalent of | | | | advance equation, but to the naked eye the |
| a one-year dog is supposedly fully grown by both | | | | equivalence of corresponding features of Dog years |
| mental and physical aspects. Dogs like humans tend | | | | and Human years are quite visible. |