Overall observation: Observe whether the puppy is too thin, whether the coat is smooth and neat, whether the movement is flexible, whether the gait is steady, and whether it lies for a long time and moves less. A healthy puppy is moderately fat and thin, has smooth and shiny coat, and is lively and active.

Observe the demeanor: Observe whether the puppy is sluggish, whether its eyes are bright, and whether it actively avoids strangers when it is seen. A healthy puppy is full of energy, lively and alert, and will hide in corners and act scared when seeing strangers.

Observe the eyes: A healthy puppy’s eyes are bright and lively, the eye circles are slightly moist, there is no secretions such as eye feces in the corners of the eyes, and the eyelashes are clean and neat.

Observe the nose: A healthy puppy's nose will be clean, moist and smooth. If the nose is often runny, it is likely to have an infectious disease. A dry nose is a sign of respiratory tract infection in dogs.

Check whether the puppies have been injected with drugs: In order to sell sick puppies, some dog dealers will do whatever they can to inject serum or globulin into the puppies to suppress the onset of the dog's disease, and inject hormone drugs to make them more effective. The puppy's high spirits make it difficult for buyers to discover the dog's true condition. Therefore, when purchasing, be sure to push aside the dog’s hair and observe whether there are any traces of injection on the neck and legs.

Observe the anus and stool: Observe whether the puppy’s anus is clean and red, and whether the nearby fur is clean and tidy. Is the stool dry, hard, green, or shapeless?