| If you puppy has not eaten for a whole day and yet has been vomiting she could be dehydrated. Dehydration can kill very quickly, especially the young. Pinch the scruff of your puppy's neck. If it stays in a fold and doesn't go back to it's original position then your puppy is dehydrated. Sometimes you can give fluids orally, like tepid water, a couple of tablespoons every 15 minutes or so for a couple of hours or more. Sometimes the dehydation is too severe and you'd need a vet to give subcutanous fluids under the skin because only that way would you puppy be able to get all the fluids she needs. In cases of severe dehydration the pet needs large amounts of fluids- too much for them to take in by mouth. Alot of vomiting can cause something called an electrolyte imbalance and also a potassium loss. That, the lack of food, and dehydration could all account for your puppy's weakness. If there is not blood in the vomit or stool it may not be parvo but with something like this it's best not to take a chance. A sudden change in food could have caused a digestive upset for your puppy , it depends on what you were feeding her. .There are electolyte and potassium replacement drinks - called Pedialyte- you can get it from a drugstore- it's for children but it's also used for pets. You would have to give it according to the directions on the side of the bottle .The thing about puppies and kittens getting sick, because they don't have strong immune systems they can go downhill very fast so if your puppy is dehydrated, still vomiting and very weak it would be best to bring her to a vet. | 
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