Pet Store Pug

How long is too long to keep a puppy in a pet store window? What do they do with them when they get too old/big? Today I was at the mall and was encourage to go see the puppies by the person I was shopping with. As I ranted about how pet store puppies come from puppy mills...I noticed a rather large Pug. Much bigger than I would expect to see at a pet store. Turns out he was born on April 1st, so he will be turning 5 month next week. As we continued our way around the mall I kept thinking of this poor little pup who had his back turned towards the viewing window facing the corner of the cage. I later returned to inquire about the pup. I asked how much he was and was told $699 discounted from $1000+. I asked how long they would keep him there. The rather grouchy woman said "until he sells". As a trainer I'm thinking he totally missed his vital socialization period and will be extremely difficult to housetrain since he has literally lived in a box for the first 5 months of his life. He happens to be a small dog...what happens to the Labs and other medium to large dog breeds that grow quickly and don't sell. They can't keep them in those small cages forever...so where do they go? When I asked if they would turn the puppy over to a shelter or rescue she said "NO". I am not someone who would ever buy a puppy from a pet store, but it was really hard for me to leave the mall without that little guy in tow. My heart breaks for him. No human or canine companionship, no toys, no exercise...what kind of puppyhood is that??? They also had a breed new to me...a "Huskita" (Husky / Akita mix)...great huh!