My dog presented liquid stool for a week and I took her to the vet. They did a fecal test and giardia test.  Both came back negative and they gave her antibiotics and put her on prescription food.  Two weeks later, her stool is still pretty mushy and today there was blood in her stool.  They suggested doing the tests again, but I declined because she hasn’t had any new exposure.  Has anyone had this experience?  What did you do?