What do you give dogs that are throwing up?

A visit to the vet to determin what is the reason he is throwing up

ok b4 u do that id wait (that's what i did) and then my dog actually threw up something i can see well, instead of blending into the carpet. then my dog finally drank some water and he wouldn't b4 cuz there was gunk in his throught (th-row-t). now hes sleeping. its been 10 min since he was puking.