When my rottie had pups and she rejected them..i had to take care of them and they were premature. The vet told me to keep them warm, so i had a heated blanket on low and kept them covered. He also told me to give them honey if it looked like they were getting to weak and about to die. I did this for one in particular, the smallest, because she wouldnt take the formula. Just put it on the tip of your finger and put it in his mouth, a little bit at a time. Good Luck, i know its heartbreaking.