My miniature schnauzer has been vomiting daily, and has light/pale pink colored gums. She has vomited semi-solid, but mostly a yellow or clear liquid (sometimes with some foam). Today, however, I believe she vomited her stomach’s fluids (green colored). After vomiting, she loses energy. She has lost weight and doesn’t eat her food in the period of time she used to. We thought it was gastritis, but when we changed her food to one that helps her digestion, it didn’t have any effect on her! What could she have?