Size of Dog	Small (<= 20 lbs.)	Medium (21-50 lbs.)	Large (>= 50 lbs.)
Age of Dog	Age in Human Years
1 Year	15	15	15
2	24	24	24
3	28	28	28
4	32	32	32
5	36	36	36
6	40	42	45
7	44	47	50
8	48	51	55
9	52	56	61
10	56	60	66
11	60	65	72
12	64	69	77
13	68	74	82
14	72	78	88
15	76	83	93
16	80	87	120

Size of Dog	Small (<= 20 lbs.)	Medium (21-50 lbs.)	Large (>= 50 lbs.)
Age of Dog	Age in Human Years
1 Year	15	15	15
2	24	24	24
3	28	28	28
4	32	32	32
5	36	36	36
6	40	42	45
7	44	47	50
8	48	51	55
9	52	56	61
10	56	60	66
11	60	65	72
12	64	69	77
13	68	74	82
14	72	78	88
15	76	83	93
16	80	87	120

About Dog Years:

As it turns out, modern science has proven the age old rule that stated 1 year for Buck is equivalent to 7 years for you is false. Dogs are destined to mature far more quickly than humans early on their lives. Consequently, the first year of man's best friend is typically set at approximately 15 human years.

The Breed and Size of the dog are also critical determinants. While smaller dogs often live longer than larger ones, they mature far faster in the early years of life. Conversely, a huge pup may age slowly at first then near what is considered middle age in human years at 5. Medium sized dogs fall somewhere in the middle for in both respects.

Clues to spot:

In the event that a dog or puppy was adopted but the owner is unaware of their history, it may be difficult to determine the dog's age. However, even without knowing the official birth date, it is still possible to guess.

Teeth can in fact provide a rough estimation. The guidelines will differ depending on the breed and the quality of dental care it has received (if any) before receiving them from their original owner.

• 2 months (or 8 weeks): All baby teeth have formed.
• 7 months (or 21 weeks): All permanent teeth have formed and are white/clean.
• 1-2 years (or 12-24 months): All teeth appear dull with many back teeth displaying signs of plaque (yellow).
• 3-5 years (or 36-60 weeks): All teeth show some wear and significant signs of plaque (yellow).
• 5-10 years (or 36-60 weeks): All teeth show significant wear and often signs of disease.
• 10-15 years (or 120-180 weeks): Most if not all teeth are significantly diseased with some often missing.

Similarly, licensed veterinarians can estimate the age of a dog based on physical examinations that focus specifically on their bones, muscles, internal organs, and joints. Several aging signs for older dogs include the following:

• Clouded eyes
• Gray hair beginning around the muzzle then subsequently spreading to other areas of the body.
• Stiff legs
• Loose skin

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