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For an upset stomach I usually recommend Immodium, however without knowing the cause of his illness, its probably best to give him time and then try to feed him in a few hours. If he eats a little bit and and does ok, you can give him a little more. If he continues to vomit, the best thing to do is to take him to see your vet (you can wait until Monday if he is otherwise acting fine and seems to be drinking and able to hold that down). If he is not able to hold down water or is lethargic or does not want to eat, the best thing to do is to have him evaluated over the weekend at the local emergency clinic. They will know how to help him and which medications will be best for him, if any.
It helps to coat and dogs that vomit from gastroenteritis may also eventually develop diarrhea. Pepto bismol is not an anti-nausea medication, it works by coating the stomach as well. If you are looking for something to reduce stomach acid you can use omeprazole over the counter (1mg per 2 lb roughly) or 5mg once daily for a small dog. If the vomiting continues, however I recommend a veterinary exam as there are lots of things that can cause vomiting and some are serious while others are less so.
You're very welcome.
1/4-1/2 teaspoon or about 1-2ml if you have a syringe to measure this way. You can give this twice a day for 2-3 days at the most but if he is continuing to vomit or is not eating or is lethargic, he needs to be examined by a veterinarian.
You're welcome. Best of luck to you!! I hope he feels better soon!!