My 3 yr dog, Oliver, has always been healthy until a few months ago. He suddenly had blood in his stool and vomit and our vet told us that the bacterica in his stomach had gotten out of balance, caused ulcers and the ulcers were now infected. He was on two bouts of antibiotics which helped some, but he wasn't back to normal even after over a month of antibiotics and waiting. I purchased MiracleZyme and within a few weeks, everything is back to normal. I'm so very thankful. Oh, and Ollie is, too!