A 1-year-old dog is equivalent to a human being about 15 years old. A one-year-old dog is in the adolescent period and has not matured mentally. Like a child, it is naughty and likes to play. When a dog is two years old, it is equivalent to a human being. Around the age of 22, dogs at this time are in their youth, their minds will become more and more mature, and they will become more and more sensible. They will no longer be as playful as before, but they will be more aggressive.