As the life span of a dog is usually limited to 15-20 years, owners should note that a two-year-old dog is a young dog, a nine-year-old dog is a middle-aged dog, and a fourteen-year-old dog is a senior dog. The general formula is “one year old dog, seven years old man”. The first year of the dog = 15 years, the second year of the dog = 10 years, and each year thereafter is equal to 3 years of human age. Owners note that small dogs or teacups: start to get older after 10 years of age. Large dogs: start getting older after 5 years of age. After the dog’s 3rd year, the age of a small to medium sized dog is approximately: 1 natural year = 5 years of dog age; large and giant dogs are approximately: 1 natural year = 6-7 years of dog age.
