Ok, let's simplify this...
WHat kind of care, forethought, testing, etc. do you think a 'breeder' has put into the breeding to ensure healthy happy offspring, IF THEY WILL SELL THEM TO A BROKER OR PET STORE AND HAVE NO IDEA WHERE THEY WILL END UP OR HOW THEY WILL BE CARED FOR?????
NO RESPONSIBLE BREEDER .PERIOD. would EVER sell their babies to someone they cannot interview first, or someone they cannot watch interact with that baby! It's just not gonna happen!
Now, someone who has two intact dogs and doesn't care about them, well... they end up at the pet store because the money is more important. THIS SHOULD BE OBVIOUS, that they aren't the best specimen of their breed, and because the money is the priority, none of theirs was spent making sure the offspring would be free of genetic disorders, vaccinating for diseases, or worming for parasites!
And, lastly, if you think what I said is not so... how many of you, if you had to give up your children, would have to interview the potential parents and approve of them before your child went with them? That's it in a nutshell... a responsible breeder makes sure their babies are going to a good home, and are on condition to be returned to the breeder if the buyer can no longer keep them.
Try even getting a Pet Store to answer your calls once they know you have a problem pet... they read the caller ID and don't answer!
Some people are so worthless that even their sh!t is worth more than they are! THINK ABOUT IT... at least their sh!t can be used for fertilizer.