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You first need to determine the cause for the vomiting and diarrhea. If your dog has not seen the vet recently for a fecal exam, I would do this first to rule out parasites as the cause.
Dogs can also have vomiting and diarrhea because of intestinal obstructions or other causes.
Your vet can recommend some immodium to help with the vomiting but you really need to find the cause before you give him anything.
Until you can see the vet, I suggest that you hold off on food until the vomiting stops. Then switch her over to a bland diet of just boiled chicken and white rice in very small amounts.
Most often this is caused by a simple parasite problem or coccidia or giardia. You can find out with a simple fecal exam.
Let me know if you still have questions.
I usually suggest not feeding them for a few hours (don't mean 24 or more, just a few) to give the stomach time to rest.
I would hold off on food for the next few hours and then try the bland food mentioned above. Feed ONLY that and see if it helps. If not, a vet visit will be needed.
Does this help more?
I have tried every brand of dog food available because we get donations. I see less diarrhea, vomiting and other stomach upset with Science Diet and Eukanuba than I do with any other foods. Everyone you talk to will give you a different answer on this, though. Even my most finicky dogs will eat the small bites.
Your dog could be having an allergic reaction to the food. If this is the case, corn and wheat could be the culprit. You can discuss the use of a low allergen food with your vet.