Comparison of Dog Ages

(updated 27 November 2022)

Dogs age more rapidly than humans. One year for a dog is equivalent to between five and eight years of human life, depending on the size of the animal.

A dog has different nutritional and health care needs in the various phases of its life. Older dogs suffer from the same ailments as elderly people, such as arthritis and loss of hearing and vision. You can get a good idea of how to take care of your dog and also understand its behavior by examining the comparison of the actual age of your dog and the corresponding age of a human.

The same is true for cats and other animals.

This lesson will answer those questions. Animal Health Disclaimer

---

Ages of dogs

Since dogs can vary from weighing only a few pounds to over 100 pounds, size is a major factor in the animal’s longevity. Productive years are when the dogs are able to reproduce.

Also see: Dog Age Calculator – With respect to breed and weight

	Age	2-20 pounds	20-50 pounds	50-90 pounds	>90 pounds
Pup	1-11 months	Juvenile	Juvenile	Juvenile	Juvenile
	1 year	12 years	12 years	16 years	20 years
Productive Years	2 years	19 years	21 years	23 years	26 years
	3 years	25 years	25 years	29 years	34 years
	4 years	32 years	32 years	35 years	42 years
	5 years	35 years	36 years	39 years	50 years
	6 years	40 years	42 years	45 years	56 years
	7 years	44 years	48 years	50 years	62 years
	8 years	48	53	56	68
	9 years	53	58	62	74
	10 years	57	62	67	80
Middle Age	11 years	63	66	72	86
	12 years	67	70	77	93
	13 years	70	74	82	101
	14 years	73	78	88	108
	15 years	76	83	93	115
	16 years	80	87	99	123
Elderly	17 years	84	92	104
	18 years	88	96	109
	19 years	92	101	115
	20 years	96	105	123
	21 years	99	109
	22 years	102	113
	23 years	104	117
	24 years	107
	25 years	109
	26 years	112

Ages of cats

See: Comparison of Cat Ages.

Ages of various animals

See: Comparison of Animals Ages.

---

Dogs are wonderful companions

---

Resources and references

Websites

Pet doctor – animal life span

Pet Health Resources