People have been using vinegar for thousands of years, and while most of it goes into salads and condiments, vinegar can be used as a household cleanser, cosmetic aid, and health treatment. Many dog lovers add vinegar to their pets’ food or apply it topically to their best friends. Advocates call vinegar, especially unpasteurized organic apple cider vinegar, a wonder food. Is vinegar really a health-improving supplement, a natural preservative, a nontoxic cleaning product, a disinfectant, a source of important nutrients, and an effective topical treatment for canine ailments?