The dog’s teeth will start to develop after 10 days of life and will be gradually replaced by permanent teeth after two months. The Teddy’s age can be seen through the physical appearance, the younger dogs have strong bones, active and agile, the 2-5 year olds become sedate but still athletic, the 10 year olds and above are very old and slow in action. Teddy can see the age through the hair, the young dog hair shiny and bright, older dogs due to reduced levels of amino acid secretion in the body, began to appear gray hair.
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