The idea that one dog year equals seven human years is a common approximation, but it’s not entirely accurate. The rate at which dogs age varies depending on their size and breed. Larger dogs tend to have shorter lifespans compared to smaller breeds.

To provide a rough estimate: For the first year of a dog’s life, they typically age more rapidly. A general rule is that a one-year-old dog is roughly equivalent to a 15-year-old human.
After the first year, the aging rate slows down. However, it still varies depending on the dog’s size and breed.