How do you tell the age of a German Shepherd? Dogs generally estimate their age based on their teeth. Under 2 months old, there are only deciduous teeth (white, thin, sharp), incisors are replaced at 2-4 months, and canine teeth (white, sharp) are replaced at 4-6 months. The cusps of the teeth are rounded and blunt), molars are replaced at 6-10 months. The teeth at 1 year old are straight, white and bright. The incisors have no cusps. At 2 years old, the cusp portion of the lower incisors is smoothed. At 3 years old, the cusp portion of the upper incisors is smoothed. 4-5 The upper and lower incisors begin to wear slightly beveled and turn yellow when they are 6-8 years old. The incisors are worn and exposed at the root of the teeth, and the canine teeth become yellow and worn when they are 6-8 years old. The tooth wear of labial dogs is related to age. The older they are, the more serious the wear is.

1. Wear and loss of teeth. Dogs will have deciduous teeth within ten days of birth. After two months, the incisors, canines, and molars will gradually be replaced by permanent teeth. The permanent teeth will be replaced in 8-10 months, but it needs Teeth can grow strong after one and a half years old. It doesn't matter if the puppy swallows the replaced baby teeth, because the baby teeth are soft and the dog's gastrointestinal tract can digest them.

To estimate the age of a dog based on teeth, please refer to the following table: Age Dental Characteristics: Under 2 months old, there are only deciduous teeth (white, thin, sharp), incisors are replaced at 2-4 months, and canine teeth (white, sharp teeth) are replaced at 4-6 months. (tips are rounded and blunt), molars are replaced at 6-10 months. 1-year-old teeth are straight, white and bright, and the incisors have no cusps. 2-year-olds have the cusp portion of the lower incisors flattened. 3-year-old upper incisors have the cusp portion flattened. 4-5 years old, upper incisors have no cusps. The lower incisors begin to wear and become slightly beveled and turn yellow. At the age of 6-8 years old, the incisors are worn and the roots of the teeth are exposed, and the canine teeth are yellowed and worn on the lips. The tooth wear of dogs is related to their age. The older they are, the more serious the wear will be. But it should also be noted that this has a lot to do with the nature of the animal's food. For example, if the dog often eats soft food and often chews bones, the dog's tooth wear will be different, so it can only be used as a reference.

2. Dogs with facial expressions aged about 1 year old have active expressions, lively and active eyes. Dogs aged 2-4 years old are approachable, energetic and enthusiastic. Old dogs older than 7 years old have sluggish energy, slow response to stimulation, unwillingness to move much, and dull eyes.

3. Body posture: Young dogs are light and nimble when moving. When they are 2-5 years old, their movements are somewhat clumsy, but they are stable, safe and reliable. Elderly dogs over 10 years old have sluggish behavior, crooked or bent backs, and walk slowly.

4. The occurrence of senile hair refers to the appearance of gray and white hair (that is, the original non-gray hair of dogs turns into gray and white hair). It first occurs in the lip area and mandibular area. Dogs aged 4-5 years old begin to see a few white hairs, and the number increases significantly at 5-6 years old. Later, it spreads to the back, around the nose, eyelids, eyebrows, etc., and then further extends to the forehead and external auditory canal. The hair on the entire head turns white. Dogs over 10 years old have a lot of white hair on their forehead, face and front of their head. After 13 years old, the entire head turns white (some dogs still have the same coat color when they are 10-14 years old). For dogs with white, yellow and white hair or chestnut hair with white spots, coat color change cannot be used as an auxiliary means to judge age.

5. Young dogs have bright eyes. Cataracts appear in the eyes of dogs over 7 years old. The incidence of cataracts is high in dogs over 8 years old. Most dogs aged 9-10 years old have cataracts.There are cataracts. Almost all dogs over 10 years old have cataracts. The lens of early cataract appears as a blue-green ring. Typical cataracts are central or pericentral, with lens opacity in gray or off-white color and obvious green refractive reflection.

Some dogs also suffer from cataracts when they are 1-1.5 years old. To use teeth to judge the age of a dog, three conditions are required: the bite of the teeth must be normal; dog feed or dog bones must be fed; and there must be no periodontal disease.

Generally speaking, a puppy has 28 deciduous teeth. It will grow canine teeth when it is three weeks old, molars when it is one and a half months old, first incisors when it is four months old, and second incisors when it is four and a half months old. The third incisor is replaced at the age of five months, and the canine teeth are replaced at the age of six months. When the dog is seven months old, all 42 permanent teeth have been fully erupted and it has entered the mature stage. At one and a half years old, the cusps of the lower first front teeth are worn; at two and a half years old, the cusps of the lower second front teeth are worn; at three and a half years old, the cusps of the upper first front teeth are worn; at four and a half years old, the cusps of the upper second front teeth are worn. At five years old, the lower first and second incisors have been worn into square shapes; at six years old, the canine teeth are blunted, and the tips of the lower third incisors are worn; at seven years old, the lower first incisors have been worn down to the root; at eight years old, the lower incisors have been worn down to the root. The wear surface of the first incisor tilts forward; over ten years old, it is impossible to judge its age by its teeth.