The life expectancy of the entire dog is commonly expressed in terms of years of dog from us and depends entirely on the dog ’s race, formed as the dog’ Around s. The various factors affecting the life expectancy of a dog. A dog ’s the duration of the second change diet provided him and also the number of health problems the dog tends to deal with over the years. The average length of a small dog as the chihuahua is about 15 to 16 years, while medium-sized dogs such as Collies-board has a duration of 10 to 13 years. It can be noticed large dogs like the great dean until only 7 to 8 years in tension. The calculation of life expectancy of particular dog can be done exactly with the help of “format or calculator” specific racial, that would be a measure of schemes for older accurate available. The format or computer-specific race gives the results approximate some dog ‘life foreseeable s based on the format as the breed of dog. It is generally assumed that, on average, “the same people from one year to a years” of the seven dogs;. This statement may not be suitable, the first two years are represented together within 18-25 years in these schemes and because the entire report can not be generalized for all dogs, however, belong to formats and different breeds. A report exact year of dog years against the human can not be given. However, some obvious characteristics remain similar between both human beings that aging dogs. It is generally assumed that the human equivalent of a dog than a year alleged completely develops from both mental and physical functions. The dogs as human beings tend to develop the characteristics muscle progress while developing a similar mental development. With an important study of the dog, was assessed for dogs of all breeds and formats that almost 64 percent of dogs “euthanized because they were influenced by a certain kind of diseases. Only 8 percent of total live dogs over 15 years and almost 16 percent of them die of diseases and cancer due annual heart. Human lives are not finished even though suffering from rare and incurable diseases, and this is why the main life of an average human being is reasonably long. The effects of aging in dogs would dormenti for several years. But as human beings, dogs to undergo physical changes in medical as well. The first sign of aging in dogs would be the decline in their activity levels. The period of sleep in these dogs also becomes longer. The canine feel a drastic change in their skin, the use of State, appetite and feel the loss of tooth as well. Their sense the hearing and vision also decreased gradually. The older dogs tend to feel stiffness in their body. All these obvious signs of aging can even be found in human beings. The years humans are extended only because of modern medicine and progress of various drugs that are intended to address the symptoms of old age. The dogs and human beings can not have the same physiology, however, some obvious similarities can be noticed when both species grow. The years of dog and human years can not be directly reported by a certain equation of progress, but to the ***** eye equivalence of characteristics corresponding year of dog and human years are quite visible.