[Missy]

My puppy slept a lot too but not as much as that. Is he drinking water normally? Eating normally? Going to the bathroom normally? If so, give it a couple of weeks, but beyond that, I'd talk to the vet.

I agree with you there. It may not be a cause for alarm if the puppy goes by its normal routine, but if it has grown quite a bit, and it's still spending a major chunk of its day sleeping, then a visit to the vet is warranted.