There is an emergency clinic in OFallon Mo. by JJs restaurant. You could also try boiling hamburger and rice. It works great for my dog. No spices just plain.
Is this an old dog or puppy. If a dog throws up for more than a 12 - 14 hrs and does not take in any water you will need to hydrate so if you have a regular vet I would try to get them in asap. The last time I went my puppy started throwing up on a Tuesday right after lunch by lunch the next day i had her at the emergency vet.because she was so young (6 weeks)
Call the emergency vet clinic to see what they recommend
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