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The chart below gives you an idea of how old your dog's body is depending on her age and size.
As a general rule, giant breed dogs are deemed senior citizens at five years of age, and dogs under 20 pounds move into the range at about seven.
Again, every dog is different, but the following chart is a good guideline.
A Dog's Age in Human Years:
Dog's 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
Ages in yellow = Senior Ages in red = Geriatric
Chart developed by Dr. Fred L. Metzger, DVM, State College, PA.
– Courtesy of http://srdogs.com/