sorry for not responding sooner, I check in as I can.
I will assume since you said she was drying up that there were no other pups in this litter? If you can get him to continue latching on, that will be the best thing, hopefully she will stimulate him to nurse frequently, I would get him on every hour if possible, and if he doesn't seem to be getting anywhere continue the supplemental feedings. There are some recipes for supplements at sites online this one has a few options
http://www.lowchensaustralia.com/bre...lefeeding2.htm