My dog is having both liquid black stool and vomiting at the same time. And when I say same time. Same time. He she passes stool. It comes out like blk liquid and while doing so she starting to heve. Then the vomit follows. Im really saddened by this. It has now been almost 48 hrs since it started. And I'm unsure what to do. I'm kinds afraid of the vet BILL.