
Agree with westlife. Have to admit that the one that has been a miracle worker for me is Dopram. Buy one whenever I have a bitch mated. Even if I end up throwing it away without using it, it is money well spent, having the stuff "just in case."
I also wouldn't be without obstetric gel. In an emergency, when you know there is no time to get to a vet, many a pup, presented badly, has been saved by being heavy handed with the gel! :-)