I hope everything works out for you and the pup... I'm not a breeder but please keep us updated.
Here is a good site for supplimenting pups and tube feeding and alot of other information that may help you.... Just keep scrolling down till you get to the breeding and whelping section. Theres alot of good information on here for you....
http://www.lowchensaustralia.com/sitemenu.htm
Good Luck
Crystal