Could have Distemper, need to know that first off, and got to go to vet...
puppies showings signs of
vomiting down the yellow/then greenish/brownish, need to be check for distemper,,,,,distemper can take a puppy's life...
Has your pup got fever??? Is its nose hot or warm, gums reddish or whitish...
syringe some mild flavor gatorade, only very little every 3-mins to hour till you get to vet, does the dog have loose bowel movements???