How to judge the age of a dog? From the physical point of view, young dogs are active, their movements are relatively stable at the age of 5, and dogs at the age of 10 will be slower. Judging from the hair, the hair near the dog's mouth will turn white when it is 5 years old. If 70% of the dog's head hair turns white, the dog is over 10 years old. If the dog's head completely turns white, it means that the dog is over 10 years old. This dog is about 13 years old.

　1. Judgment of posture

Young dogs are lively and active, and can be said to be as light as a swallow. For obstacles, they will boldly choose to try to overcome them. When dogs are 5 years old, they will choose safety first and are no longer as adventurous as they were when they were young. Therefore, at this time, they will maintain a relatively stable state of action. However, 10-year-old dogs have entered old age, their movements will become sluggish, and some dogs will also have a hunchback, which is easy to identify.

　2.Hair information

As long as the dog's original hair is not white, you can judge its age by whether white hair grows on the dog's body. Generally speaking, the hair near a dog's mouth will first turn white when it is 5 years old, and then slowly extend to the entire face and back. If 70% of the hair on a dog’s head has turned white, the dog is over 10 years old. If all the hair on the dog’s head has turned white, it means the dog is over 13 years old.

　3. Eyes

Eyes cannot deceive people. A puppy’s eyes are clear and free of impurities. The watery little eyes look at you and make you cute in minutes. Dogs in their youth have bright, resolute and piercing eyes. When dogs enter their old age, they are likely to suffer from cataracts. According to data, dogs over 10 years old generally suffer from cataracts. Moreover, at this time, their eyes' reaction to stimulation will be significantly slower than that of puppies and adolescent dogs.

4. Observe the teeth

Generally, a dog’s deciduous teeth will grow out about ten days after birth. After two months, the dog’s teeth will slowly transform from incisors, canines, and molars into permanent teeth. By the age of ten months, all the dog's teeth will be replaced by permanent teeth. The specific situation is divided into: 19---28 days, the primary incisors grow in; 21---28 days, the third primary premolars grow in; 21---35 days, the primary canine teeth grow in; 21---42 days , the fourth deciduous premolar erupts; 28---42 days, the second deciduous premolar erupts; at 2 months, all teeth grow together. Then, every month, the dog's teeth will be replaced from deciduous teeth to permanent teeth. Until the age of 1 year, all permanent teeth have appeared.