Growing up in the country I saw lots of births. Dog and cats. They all went well and we had to do nothing. Once my sisters dog was having her puppies and one wouldn't come out so she had to take her to the vet for help.
And another time my friends Rottie has puppies and one was stuck. With her mom on the phone helping we were able to get the puppy out. Only one of those 4 or 5 pups lived though. We blame it on the fact that the momma dog had gotten into rat poison when she was pregnant. Momma dog was fixed shortly after this and lived to a good old age of 13 years.