Just had my female dod spayed. She was still nursing her 8 week old puppies. How do I make the pups stop?

Your timing was way off and I'm surprised the vet did the surgery while she was still nursing the pups. You'll need to consult your vet to see if they need to be bottle fed or if they are ready for puppy food. Is she still able to nurse? If the milk dries up the pups will stop.