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How to determine a cat's or dog's age

Examining teeth is one of the best ways to determine the approximate age of a cat or dog. Look at the degree of growth to determine the ages of kittens and puppies, and look at the degree of wear to determine the ages of adult cats and dogs.The diagram and chart below can help. Be aware of two things that can throw off your estimate. First, an animal who has received dental care will have better-looking teeth than an animal who has not received such treatment. Second, variations exist among animals, even two from the same litter. Teeth are only a rough indicator of any animal’s actual age.

Note:The location of teeth in a dog’s jaw is similar to the cat’s jaw shown here.
ESTIMATED AGE CAT’S TEETH DOG’S TEETH
2-4 weeks Deciduous (baby) incisors coming in No noticeable tooth growth
3-4 weeks Deciduous (baby) canines coming in Deciduous (baby) canines coming in
4-6 weeks Deciduous (baby) premolars coming in on lower jaw Deciduous (baby) incisors and premolars coming in
8 weeks All deciduous (baby) teeth are in All deciduous (baby) teeth are in
31⁄2 - 4 months Permanent incisors coming in No noticeable permanent tooth growth
4-5 months Permanent canines,premolars, and molars Permanent incisors coming in; some growth coming in of premolars and molars
5-7 months All permanent teeth in by 6 months Permanent canines,premolars, and molars coming in; all teeth in by 7 months
1 year Teeth white and clean Teeth white and clean
1-2 years Teeth may appear dull with some tartar build-up Teeth may appear dull with some tartar (yellowing) on back teeth build-up (yellowing) on back teeth
3-5 years Teeth show more tartar build-up (on all teeth) Teeth show more tartar build-up (on all teeth) and some tooth wear and some tooth wear
5-10 years Teeth show increased wear and disease; pigment Teeth show increased wear and disease visible on gums
10-15 years Teeth are worn and show heavy tartar build-up Teeth are worn and show heavy tartar some teeth may be missing build-up; some teeth may be missing