Dog being sick............?

If he doesnt stop throwing up i would try taking him or ringing a vet for ur reurance, i would try offer him food, you can always tell if a dog is really unwell if they do not want to eat, he might of eaten something outside to upset his stomach, theres alot to take into concideration but id just be ringing a emergancy vet n see what they can tell ya, they might even be able to give u a pointer to stop him being sick, thanks