[yorkietalkjilly]

I think you need a specialist's advice here if your vet doesn't know what's wrong. I would take her to an internist for a thorough check-up just to be on the safe side.

My first Yorkie, Scotty, did something like this, though he didn't yelp out - just went down suddenly in the den floor so, thinking disc rupture or something awful, I immediately called and rushed him to the vet who had to come in on a Sunday afternoon to see Scotty for an emergency check-up and it proved to only be gas pains - though he totally would not stand and wasn't able or willing to walk at home - yet he stood right up as soon as I placed him on the vet exam table, happy and friendly to greet the vet on his only day off! The vet did find he had a gassy, slightly distended tummy and gave him something for the gas. And Scotty lived on for years after that episode as a healthy, happy dog. I think I read somewhere online a while back that the number one reason for owners bringing their dogs for emergency care is GI-related.

But your dog could have a very serious situation that needs diagnosis and treatment - it's the lack of any findings or a diagnosis by your vet that would worry me.