You need to take the dog to the Vet for an examination. If a puppy of eight weeks is throwing up that much you must quickly find out what the cause is. If it turns out to be a minor ailment the Vet will give you something to settle the dog's stomach.
Please let us know what the dianosis and progress is.
It is very important to make sure that was not oil based paint. If it was you still need to take the dog to the Vet and bring the paint with you. Oil Based paint is toxic and can be fatal when ingested by a dog.
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