As a general guideline, though, the American Veterinary Medical Association breaks it down like this: 15 human years equals the first year of a medium-sized dog's life. Year two for a dog equals about nine years for a human. And after that, each human year would be approximately five years for a dog.
A dog's age (in years) x 7 = Age in “dog years.” For example, if your dog was born 7 years ago, he is 49 years old in “dog years.” (Or, stated differently, a 7-year old dog is at a similar stage in aging to a 49-year old human.)
Current guidelines now conclude the following : 15 human years equals the first year of a small-large sized dog's life. A 2-year-old dog is equivalent to 9 human years. And after that, each human year would be approximately five years for a dog.
The greatest reliable age recorded for a dog is 29 years and 5 months for an Australian cattle dog named Bluey, owned by Les Hall of Rochester, Victoria. Bluey was the name of the oldest dog ever reliably recorded. She was an Australian cattle dog, and she lived to be 29 years and 5 months.
The Average Dog Lifespan
The average lifespan for dogs is between 10-13 years, though there is variability among breeds and sizes.
420 Dog years old, 60 yrs old b-day equivalent in human age.
Generally speaking, a healthy dog with a short, smooth coat and no skin problems doesn't need to be bathed often. In most cases, dog baths are more for the benefit of their pet parents than for the dogs themselves. Even so, it's a good idea to bathe your pooch at least once every two to three months.
In Dr. Urfer's study, small dogs had a longer median lifespan at 14.95 years, medium-size dogs lived an average of 13.86 years, and large dogs lived 13.38 years.
Age is not a disease, and your dog is never “too old” to receive the quality care he or she needs, even if it requires anesthesia and surgery.
A dog's first year of life is the equivalent of about 15 human years. A dog's second year is the equivalent of nine human years (making a 2-year-old, medium-sized dog about 24 years old in human years). From the third year onward, each canine year is the same as about five human years.
A 16-year-old dog, depending on his size, is roughly the equivalent of an 80- to 123-year-old person. Like elderly humans, your dog is moving more slowly and sleeping more than he did in his spryer years.
At four months old, he is probably roughly the same age as a two or three-year-old human. This will depend a little bit on the breed and size of the dog. Some dog breeds develop more slowly than others (physically, mentally, or both), but just like with humans, everybody pretty much catches up to each other eventually.
In many cases, you can probably tell very easily that your dog knows the difference between an adult and a baby. Dog owners often remark on the way their dogs treat babies.
Adult dogs that are one year or older should be able to hold their pee in for up to 6-8 hours. However, 8 hours is a bit of a stretch, and ideally, you should not expect your dog to hold their urine for longer than 6 hours.
One study of over 3,000 British dogs that did analyze sex differences found that neutered female dogs were the longest-lived sex, intact females the shortest-lived, with males of either neutering status being intermediate in longevity (15).