As a side note, I know some rescue organizations do take the older unwanted pups from the puppy stores that can't be sold. One is in St Louis called
Posh Puppies. There website says they focus on rescues from commercialized kennels (i.e. puppy mills), liquidations, "pet store rejects". I have worked with them in the past and know that some of their dogs are the ones that got 'too old' for the pet stores.