That's sad
Even if people DO choose to breed tiny dogs, they should realize that they need more care and need to be looked after with their mom a lot longer than a bigger pup...5 weeks is WAY too early for a hammy sized pup..I'd say they'd need at least 12-14 weeks until they even THINK about being sold.
Petstores really are getting more and more ignorant of the kind of animals they sell, aren't they? My cousin went to buy a rabitt (she's 7), and found a really cute one. The lady at the store didn't even know how old it was when she asked!