Age judged by dental growth 18-22 days: puppy teeth begin to emerge. 4-6 weeks of age: milk incisors complete. 2 months of age: all milk teeth complete, white, fine and shiny. 3-4 months of age: first milk incisors replaced. 5-6 months of age: second and third milk incisors and milk canine teeth replaced. 8 months of age: all milk teeth fall out and permanent teeth replaced. 1.0 years of age: permanent teeth complete, white and shiny, cusps on incisors not worn. 7.0 years old: the first incisor of the lower jaw is worn to the root, the wear surface is longitudinally oval. 8.0 years old: the wear surface of the first incisor of the lower jaw is tilted towards the front. 10 years old: the wear surface of the second incisor of the lower jaw and the first incisor of the upper jaw is longitudinally oval. 16 years old: the incisors are lost and the canine teeth are incomplete. Activities begin to be somewhat clumsy, but stable, safe and reliable; 10 years of age or older dogs, because with the body function, musculoskeletal health declined, began to skin flaccid, sluggish demeanor, backbone curved or bent back, walking slowly, hearing loss, often forget things, etc.. The hair reveals age as the dog gets older and the level of amino acid secretion in the body decreases, it is easy to start to appear gray hair. That is, in the non-gray hair area on both sides of the nose, chin chin and other places where the hair color becomes white. Dogs 4-5 years of age began to see a few white hair, 5-6 years of age significantly increased, later spread to the back, around the nose, eyelids, eyebrows, etc., and then further expanded to the forehead and the outer ear canal inside the long white hair, 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 the front of the head. Over 13 years of age, the entire head becomes white, and there are some dogs that remain the same color at 10-14 years of age. For dogs with white, yellowish-white hair or chestnut colored hair with white spots, the change in hair color cannot be used as an aid to determine age
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