Counting the years of our pet friends, particularly cats and dogs, is commonly done using a “pet year” conversion, which attempts to account for how pets age faster than humans, especially during their early years. However, the method isn’t always straightforward, and there’s some variability based on the species, breed, and individual health of the pet. Here’s a general guide for how to think about your pet’s age:
For Cats:
- The first two years of a cat’s life are roughly equivalent to 24 human years. After that, each additional cat year is approximately 4 human years.
- Example: A 1-year-old cat is about 15 years old in human terms. A 2-year-old cat is about 24 human years old. By the time a cat is 5 years old, it’s roughly 36 in human years.
- Example: A 1-year-old cat is about 15 years old in human terms. A 2-year-old cat is about 24 human years old. By the time a cat is 5 years old, it’s roughly 36 in human years.


For Dogs:
Dog aging can vary significantly by breed and size, with smaller dogs typically living longer than larger dogs. The general method is:
- The first year of a dog’s life is roughly equivalent to 15 human years.
- The second year adds about 9 human years.
- After the first two years, each additional year corresponds to approximately 4-7 human years, depending on the dog’s size and breed.
- Example: A 1-year-old dog is about 15 human years old. A 2-year-old dog is about 24 human years. A 10-year-old small dog might be around 56 human years, while a large dog could be closer to
66.
- Example: A 1-year-old dog is about 15 human years old. A 2-year-old dog is about 24 human years. A 10-year-old small dog might be around 56 human years, while a large dog could be closer to
Considerations:
- Breed and size matter for dogs: Larger dogs age faster and have shorter lifespans, while smaller dogs age slower and live longer.
- Cats generally have a more consistent aging process compared to dogs, but individual health factors can still influence the rate of aging.
Ultimately, the way we count our pets’ years helps us understand their life stages and needs, but it’s important to remember that each pet is unique, and their care requirements may differ based on their health, breed, and temperament.