Under normal circumstances, the permanent teeth of adult dogs are scattered: 6 incisors on the left and right, 2 on the left and right in dog age, and 8 premolars on the left and right. , there are 4 molars in the upper jaw and 6 in the lower jaw, a total of 42 molars. The number of deciduous teeth in young dogs is scattered: 6 incisors on the left and 2 on the left, 2 on the left and right canine, 6 premolars on the left and 6 in total, 28 in total. The age of an adult dog is most obvious in the growth, wear, and sharpness of the teeth. The age of the puppy can be inferred from the number, strength, age, brightness, etc. of the canine teeth. Determining the age of a dog is roughly based on the following criteria:

< img border="0" hspace="0" src="/pic/img46021361265342_y.jpg" ptype="1" alt="Illustration of how to estimate dog age through canine teeth" title="Illustration of how to estimate dog age through canine teeth" >

Within 20 days, the teeth will gradually grow in unevenly.

In 30-40 days, the deciduous incisors will grow together.

At 2 months, all the deciduous teeth are fully elongated, pointed and tender white.


2-4 months, replace the first deciduous incisor.

5-6 months, replace the second and third deciduous incisors and all deciduous canines.

Over 8 months old, all teeth are replaced by permanent teeth.

1 year old, the permanent teeth are all long, bright and tough, with sharp protrusions on the upper part of the incisors.

At 1.5 years old, the peak of the first mandibular incisor disappeared.


At 2.5 years old, the peak of the second mandibular incisor disappeared.

At 3.5 years old, the peak of the maxillary first incisor disappeared.

At 4.5 years old, the peak of the second maxillary incisor disappeared.


At the age of 5, the peak of the third mandibular incisor was slightly worn, and at the same time, the first and second mandibular incisors were worn into a rectangular shape.

At the age of 6, the peak of the third mandibular incisor disappeared and the canine teeth were blunt and rounded.

At the age of 7, the mandibular first incisor was worn to the root of the tooth, and the wear surface was vertically oval.

At the age of 8, the first incisor of the mandible was worn and tilted forward.

At the age of 10, the wear surfaces of the second mandibular and maxillary first incisors were longitudinally oval in shape.

At the age of 16, the incisors were lost and the canines were incomplete.

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