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Unless you are getting a new puppy from a reputable breeder, you are supporting the billion dollar puppy mill industry via their outlets (petshops) or backyard breeders (who buy their stock from petshops and other backyard breeders). Reputable breeders NEVER sell their puppies through petshops.
The rule of thumb to help you determine which category is selling you that puppy is to see if you can visit their facilities and see the conditions, meet the puppy's parents, etc. If not, it is always a 'buyer beware' situation.