[header] How to choose a healthy puppy [title] Get one at the right age. [step] In general, puppies should be kept with their mothers for at least the first eight weeks of their lives. If the dog breed is small, such as a yorkshire terrier, it is better for a puppy to live with her littermates or parents for the first 12 weeks so they can mature enough to live with other people and animals. 
[substeps] If you find a breeder who is selling puppies younger than eight weeks old, ask the breeder why, since it is too young. [title] Check the puppy's cleanliness.