Bring her and the puppies to a vet immediately.
Puppies are 3 days old...
Alternative treatments can be effective in treating vomiting, but not the underlying cause. A physician should be consulted if vomiting is recurrent and/or lasts for more than a few days.
Within about 7-10 days at the longest. Make sure the puppies are not sneaking in and nursing off of her. As long as there is a demand for her milk, it will not dry up. She must be kept separate from the pups so her milk can dry up.
a dog will only eat her puppies if she feels like she is not ready for puppies after the first one you should be fine but still keep an eye on them for the first few days
Canine lactation is very similar to human lactation in that it is usually brought on by pregnancy and birth, but sometimes it can be a hormonal imbalance. If the dog's puppies are nursing, to stop the female dog from lactating, remove the puppies. However, you need to make sure the puppies will be fed and taken care of properly before removing them, because sometimes only the mother can care for the pups. The lactation should stop with a few days to a few weeks afterward. If the female is still lactating or if you wish her to stop sooner, you may take her to a vet and see if you can get a prescription of hormones for her to counterbalance her natural hormones and make her stop; follow the directions carefully with the hormones. If not administered properly, you can screw up your dog's hormone balance and have negative and even adverse effects.
The first 4 days are the most critical for nursing. New born puppies must receive the vital colostrum milk within 12 hours, so that natural immunities are passed from mother to pup, but is most effective in the first couple of hours of birth. After this pups should be feeding roughly every 2 hours for the first few days but this will start to reduce to 3 and 4 hours leading up to weaning stage. During the first 7 days you should be available 24/7 for your pups as you need to be able to spot any weaker pups, particularly in larger litters. You may also want to partially handfeed some puppies in a large litter so mum doesn't get drained.
Puppies typically transition from milk to solid food between 4-5 weeks of age. The mother's milk usually dries up between 2-4 weeks after the puppies stop nursing.
All puppies eyes have a clear film on them when they first open...don't be alarmed, it should go away in a couple days!
Get it to the vets, pronto
4 weeks - 28 days, or later
Kittens are between 7-10 days and puppies 9-11 days
If a dog starts to lactate it is usually about 1 or 2 days before they give birth.