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hi there , this is Dr. Levinson and i'll try to help you out tonight
If you're seeing worms in the stool, which is a VERY common puppy problem try to get some over the counter dewormer for him. You can get at PetSmart/Petco/Mini pet mart or other pet store. If he's vomiting I would fast him for at least 6 hours and then try feeding him a very small meal of boiled rice and chicken. Y9ou can add water to the rice as he is not drinking.