Human years
0-20 lbs
21-50 lbs
51-90 lbs
> 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
= senior
19 =
92
101
115
= geriatric
20 =
96
105
120
Chart developed by Fred L. Metzger, DVM, State College, PA