A common question that veterinarians are asked is “How old is my dog/cat in relation to human years?” The old seven-year rule does not apply anymore. Below is a helpful guide which will assist you in determining just how old your pet really is. You will notice that the smaller the pet, the longer the lifespan. There is definitely a correlation between size and age.
Age | 0-20 lbs | 20-50 lbs | 50-90 lbs | > 90 lbs |
1 | 7 | 7 | 8 | 9 |
2 | 13 | 14 | 16 | 18 |
3 | 20 | 21 | 24 | 26 |
4 | 26 | 27 | 31 | 34 |
5 | 33 | 34 | 38 | 41 |
6 | 40 | 42 | 45 | 49 |
7 | 44 | 47 | 50 | 56 |
8 | 48 | 51 | 55 | 64 |
9 | 52 | 56 | 61 | 71 |
10 | 56 | 60 | 66 | 78 |
11 | 60 | 65 | 72 | 86 |
12 | 64 | 69 | 77 | 93 |
13 | 68 | 74 | 82 | 101 |
14 | 72 | 78 | 88 | 108 |
15 | 76 | 83 | 93 | 115 |
16 | 80 | 87 | 99 | 123 |
17 | 84 | 92 | 104 | 131 |
18 | 88 | 96 | 109 | 139 |
19 | 92 | 101 | 115 | |
20 | 96 | 105 | 120 | |
(Chart developed by Dr. Fred L. Metzger, DVM, State College, PA. Courtesy of Pfizer Animal Health.)
