At 2 months of age, all the milk teeth are complete, thinly pointed and tender white. 2-4 months, the first milk incisor is replaced. 5-6 months, the second and third milk incisors and all the milk teeth are replaced. 8 months or more, all the teeth are replaced with permanent teeth. 1 year, the permanent teeth are complete, polished and firm, with cusps on the upper incisors. At 2.5 years of age, the cusps of the second mandibular incisor were worn out. At 6 years of age, the cusps of the mandibular third incisors were worn out and the canines were bluntly rounded. At 7 years of age, the first mandibular incisor was worn down to the root of the tooth and the wear surface was longitudinally oval. At 8 years of age, the first mandibular incisor is worn down to the front. At 10 years of age, the second mandibular and first maxillary incisors were worn in a longitudinal oval shape. At 16 years of age, the incisors were lost and the canine teeth were incomplete. At 20 years old, the canine teeth are lost Teddy’s general life expectancy is 12-15 years Teddy’s age can be distinguished by his face Dogs aged around 1 year old have an active expression, glance and good movement. 2-4 year old dogs are affectionate and close to people, glowing and enthusiastic. Older dogs older than 7 years old, mentally sluggish, slow to respond to stimuli, reluctant to move more, eyes listless. 3, physical posture young dog activities when the body is light and dexterous, 2-5 years old when the activity is a little clumsy, but stable, safe and reliable. 10 years of age or older dogs, sluggish demeanor, hunchback or bent back, walking slowly. The occurrence of old age hair refers to the emergence of gray hair (i.e. the original non-gray hair of the dog becomes gray hair), first occurring in the lip area, jaw area. 4-5 years old dogs begin to see a few white hairs, 5-6 years of age significantly increased, later diffused to the back, around the nose, eyelids, eyebrows, etc., and then further The white hairs on the frontal area and in the external ear canal, and even the entire head hair becomes white. Dogs over 10 years of age have a large amount of white hair on the forehead, face and front of the skull. Over 13 years of age, the entire head becomes white (there are some dogs that remain the same color at 10-14 years of age). For dogs with white, yellow-white hair or chestnut with white patches of hair, the change in coat color should not be used as an aid to age determination.
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