Thanks for the replies! My head keeps saying that he's sleeping because he's just stressed, but I really needed to hear it from someone else. After what happened with Dewey it's hard not to worry.

I just have to remember that he's been through a lot. I think he was captured by animal control on the 27th, so since then he's been crammed in a cage with other dogs, given shots by stranger, been neutred and taken to a new home. I would be more than stressed in that situation! And of course who knows what he was living like before he was taken to the pound.