Before the c-section, ask the animal owner about
1) The age of the doe and her kidding history.
2) The amount of time in hard labor. The quicker you get your doe to the vet, the better her odds of recovery.
3) Her tetanus vaccination status. She may need tetanus antitoxin after surgery.
4) Milk half of her colostrum before she is anesthetized. If any kids survive, you can bottle feed an undrugged meal or two. If you have surplus colostrum, freeze it for future use.