Judge a dog’s age by its teeth

A dog’s teeth usually develop within ten days of birth, and the deciduous teeth will gradually be replaced by permanent teeth after two months. It is more suitable to use teeth to judge the age of puppies, because dogs who have replaced their permanent teeth will have different degrees of tooth wear due to long-term eating habits and other reasons, making it difficult to judge.
Around 1-15 days: There are no teeth in the dog’s mouth, and there are small bumps on the gums around 15 days.
About 15-20 days: Teeth begin to develop, and slowly grow small, irregularly arranged teeth.
Around 28-60 days: All the thin and pointed white deciduous teeth appear.
8 months to 12 months: All teeth will be replaced with white and bright permanent teeth.

Judge a dog’s age by its body shape

Young dogs have strong bones, are lively and active, and have agile and changeable athletic bodies. As dogs age between 2 and 5 years old, their actions become calmer, but they are still vigorous. Dogs aged 10 years and above are very old, equivalent to more than 60 years in humans. At this time, the dog's muscles become loose, the bones become fragile, the body function declines, and the movement becomes slow.

Determining a dog’s age by its hair

Young dogs’ hair is shiny and shiny, while older dogs begin to have gray and white hair due to reduced levels of amino acid secretion in the body. However, this method has no effect on dogs that are white, yellow-white or with white spots. There are also a few dogs whose coat color remains unchanged.
4-5 years old: A few gray and white hairs.
5-6 years old: The gray-white hair increases significantly and the area becomes wider.
10-14: There are a lot of gray and white hairs on the dog’s face and forehead.

Judge a dog’s age through its eyes

Young dogs’ eyes are clear and watery. However, as we age, our eyes will become dry, tear stains will worsen, and our eyes will gradually become cloudy.