It may be too late. You could get him to a vet and perhaps a vet could save him. He needs his body temperature raised and he probably needs an iv of fluids. How old is the pup?
Here is a excellent article that has a recipe for a glucose solution (10th paragraph) you can make and give a pup orally but it sounds like you may have waited too long for it to help.
http://www.showpapillons.com/formula.htm
I pray the little guy makes it. Sometimes no matter how hard we try, some of them just can't make it. Please keep us updated.