How old is your pet in human years?
Pick your pet, slide to their age, and watch them grow up next to a person the same age. Based on veterinary age charts and adjusted for size.
Your dog is about
36in human years
Medium-size dog age chart
A dog is about 15 in human years at age 1 and 24 at age 2. After that, size matters: bigger dogs age faster, so at age 10 a small dog is about 56 while a giant-breed dog is about 79.
| Age | Human age | Life stage |
|---|---|---|
| 3 months | 5 | Puppy |
| 6 months | 10 | Puppy |
| 1 year | 15 | Young adult |
| 2 years | 24 | Young adult |
| 3 years | 28 | Mature adult |
| 4 years | 32 | Mature adult |
| 5 years | 36 | Mature adult |
| 6 years | 42 | Mature adult |
| 7 years | 47 | Mature adult |
| 8 years | 51 | Mature adult |
| 9 years | 56 | Mature adult |
| 10 years | 60 | Senior |
| 11 years | 65 | Senior |
| 12 years | 69 | Senior |
| 13 years | 74 | Senior |
| 14 years | 78 | Senior |
| 15 years | 83 | Senior |
| 16 years | 87 | Senior |
| 17 years | 91 | Senior |
Medium-size dog age FAQ
How old is a 5-year-old medium-size dog in human years?
About 36. At 5 years, a medium-size dog is in the mature adult stage of life. Yearly bloodwork is a good idea from here to catch problems early.
Is one year really seven human years for a medium-size dog?
No. A medium-size dog is already about 15 in human years at age 1 and about 24 at age 2. After that, each year adds roughly 5 human years.
How long does a medium-size dog live?
Most medium-size dogs live about 11–14 years, which is roughly 65 to 78 in human years. Good weight control, dental care and regular check-ups help them reach the upper end.
When is a medium-size dog fully grown?
A medium-size dog usually reaches adult size at about 12 months.
When is a medium-size dog considered a senior?
From about age 10, which is roughly 60 in human years. Bigger dogs reach this stage sooner than small ones. From then on, vets usually recommend a check-up every 6 months, including bloodwork.
What health problems should medium-size dog owners watch for?
Common concerns in medium-size dogs include obesity, ear infections, skin allergies and hip dysplasia. Regular exams help catch these early.
Sources: AVMA dog age chart; AAHA Canine Life Stage Guidelines; AAFP/AAHA Feline Life Stage Guidelines; International Cat Care. This tool gives general estimates, not veterinary advice.
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