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HOW OLD IS YOUR DOG?

We are frequently asked how old in “people years” a dog is.  Many people believe that 1 year of a dog’s life is equivalent to seven human years.  In fact it is much more variable than that and is different for different weight categories of dogs.  It is true that small breeds of dogs, in general, live longer than their larger counterparts.  Below is a chart that is probably the closest to what is currently believed for an age chart for dogs.
General Practice & Preventative Medicine - Theriogenology

A Dog's Age in Human Years

Age Up to 20 lbs 21-50 lbs 51-90 lbs Over 90 lbs
5
36
37
40
42
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
18
88
96
109
19
92
101
115
20
96
105
120

Purple Numbers = Senior

Red Numbers = Geriatric

Chart developed by Dr. Fred L. Metzger, DVM, State College, PA. Courtesy of Pfizer Animal Health.