All animals “age” at different rates, and our domestic dogs and cats are no exception. Unlike humans, these pets seem to age more rapidly in terms of human years, with both animals being of an age equivalent to about 15 human years by the time they are one year old. There are, however, some differences for dogs. Some people have determined an age range depending on the size of the animal. For example, a dog over 90 pounds may only be equivalent to 12 human years by the time it is one year old; a dog 51 to 90 pounds is about 14 human years old when it is one year old; and dogs under 50 pounds are the equivalent of 15 human years by their first year. These age differences are reflected for the entire life of the dog. Below is a simplified table illustrating dog and cat years and their human age equivalents.
Human Age
Equivalent |
Cat Age |
Dog Age |
| 10 years |
|
5 months |
| 13 years |
|
8 months |
| 14 years |
|
10 months |
| 15 years |
1 year |
1 year |
| 24 years |
2 years |
2 years |
| 28 years |
|
3 years |
| 32 years |
3 years |
4 years |
| 36 years |
5 years |
5 years |
| 40 years |
6 years |
6 years |
| 44 years |
7 years |
7 years |
| 48 years |
8 years |
8 years |
| 52 years |
9 years |
9 years |
| 56 years |
10 years |
10 years |
| 60 years |
11 years |
11 years |
| 64 years |
12 years |
12 years |
| 68 years |
13 years |
13 years |
| 72 years |
14 years |
14 years |
| 76 years |
15 years |
15 years |
| 80 years |
16 years |
16 years |
| 84 years |
17 years |
17 years |
| 88 years |
18 years |
18 years |
| 89 years |
|
19 years |
| 92 years |
19 years |
|
| 93 years |
|
20 years |
| 96 years |
20 years |
21 years |
| 99 years |
|
22 years |
| 103 years |
23 years |
|
| 106 years |
24 years |
|
