I'm sorry it's so long you had to wait for an answer.
You don't give much information. there could be lots of different reasons for his vomiting. Sometimes it's nothing serious, he could have eaten something bad, he could have a stomach virus (yes dogs get them) or drunk some bad water somewhere.
But it depends on how sick he is generally. If he keeps vomiting -say more than twice or three times, then take him straight away to the vet. If he doesn't want to walk or play, is staying on his bed, same thing. If he is showing any signs of pain (shaking or shivering) or when he stands up, his back is hunched and his tail between his legs (that can mean abdominal pain)
Dogs can become dehydrated very quickly if they vomit too much. The worst thing is sometimes they crave water, then vomit it up, then drink again, and the same thing happens. That can be very dangerous because they are not keeping any fluids down.
Most times a dog eats something bad -it throws up maybe once maybe twice, and then after a few hours is just fine and back to normal. A good idea is to withhold all food for a while to give the stomach chance to settle. But make sure he does drink water.
Then when he feels like eating and seems ok, try some plain boiled chicken and rice (easily digestible) Don't give him too much at once. Try a small amount, then wait a few hours to see if he keeps it down. If so, and he seems hungry, give him some more.
But you have to be careful this vomiting doesn't mean something more serious. So please take him to the vet quickly if you have any doubts, or like I said, if he throws up more than twice or three times.
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