Why does my 5 month old Shar-pei wake up in the night to vimit which looks like bile?

I think you should check with the vet on that one. Could be several things, not necessarily what somebody else's dog had.

Take the puppy to the vet asap. My last shar pei puppy had her intestine twist out through the wall of her abdomin and was vomiting. If we hadn't have taken her in for surgery she would have died.