When a dog is bought from a pet store, it is very likely that the dog is bred from a puppy mill, which means that there is a high risk of the dog having problems that may appear either right after it is brought home, or later when it grows older, be it a few days, few months or even a few years later. Usually owners are more likely to be tempted into buying because of the vase marketing tactic and cheap price tag. I am not saying that expensive = good, but when someone sells a dog below the market price, there must be a reason behind, think about it, if you are on a budget and live on breeding dogs to survive, what would you do? Just do a simple calculation and you will get the idea.