Was waiting for other opinions before sharing mine.
It looks like someone is successfully exploiting emotional blackmail for profit (and expanding on it, re, article).
While I'm assuming that on this forum, we all know that petstore dog purchases are a bad idea for a number of reasons (supports puppy mills, poorly bred under socialized dogs, etc), but given that there is an endless supply of folks that don't know that, and walk in and buy, this latest strikes me as a case of 'adding insult to injury'.
I'm guessing the petstores in question don't try too hard to explain the terms to their prospective customers. I'm guessing the customers have no idea that 'leasing a dog' is even a thing so are not on their guard for that when reading what they think is a standard installment contract.
Leasing dogs in this case is also exploiting a loophole in the usury/loans laws (interest rates on loans are capped), leasing gets around that (better stated in the article)
And of course, given the potentional for profit, I can see the company expanding into actually breeding dogs to fit their profit models, petstore not required.
My short opinion is--I find the whole concept deeply disturbing.