[header] How to pick a puppy from a litter [title] Try to buy a puppy from a breeder instead of a pet store. [step] While it may be tempting to scoop up the adorable pup in a pet store window, buying a pup this way can be risky. Most pet store puppies are on their own in a small glass cage. 
So you won't get the opportunity to see how the pup interacts with his litter mates. This will make it difficult to assess the pup's personality and demeanor.