1 dog year isn’t equal to 7 human years.
Dogs don’t age parallel to people, they actually age more quickly at first, then slow down. Depending on their size and breed, a 1-year-old dog is about the same as a 15-year-old person, a 2-year-old dog is like a 24-year-old person, and every year after that is equal to about 4-6 human years.