As of 2015, pet stores can still legally sell puppies in most of the United States, although some individual states and local governments have banned the practice. However, many are choosing not to because of ethical concerns and the increasing number of customers who do not support the practice.
Some states that do not ban the sale of puppies do require strict documentation about where the puppies came from. Pet store puppies are generally produced in unethical and sometimes inhumane ways. They have a high likelihood of genetic illnesses because their breeders are typically more interested in profit than in producing a healthy dog. They also often spend their early lives in overcrowded puppy mills, where they may not be taken care of well.