Yes, there's a difference between cat years and dog years. What we call "dog years"(to calculate a dog's "human" age), is simple. For every human year a dog has lived, that's 7 "dog years". So a 2 year old dog is 14 dog years, while a 5 year old dog is 35 dog years. A cat's age is a little more tricky. Different sources vary slightly, but this is the most common way. The first year of a cat's life is 15 "cat years". Then you add 9 "cat years" for the second year, so a 2 "human year" old cat is 24 "cat years". For every "human year" after that, you add 4 "cat years". An 8 "human year" old cat would be 48 "cat years".

"human year" = 365 days, one revolution around the Sun

"cat year" = the comparative "year" for a cat based on milestones, such as walking, sexual maturity

One dog year is equal to approximately seven human years. To figure out your dog's age in dog years, simply take his age in human years and multiply by seven.

Age in human years X 7. Each dog year is 7 human years.

100 years old in dog years

in human years, age 2.

In dog years [2x7] 14