I saw my share of pups like this just a couple of days ago.  A lady and a teenage girl were walking around Petco with a tiny puppy s**tzu and bragging that it was only 4 weeks and 2 days old and that it was for her young son!  My boyfriend and I were so angry.  You just want to say something...but you can't.  
I'm really happy you came upon your little guy.  He is very lucky to have gotten you as his new mommy!  Please keep us updated on how he is doing and what your vet has to say  
