Dog skin & coat supplements are nutritional products formulated to support a healthy, shiny coat and soothed, resilient skin. Common, well-studied ingredients include omega-3 fatty acids (EPA and DHA from fish or krill oil) and omega-6 fatty acids (from plant oils), which reduce inflammation and improve hair follicle health; biotin and zinc, which support keratin production and skin repair; and vitamins A and E, which act as antioxidants and help maintain skin barrier function. These supplements come in many forms—liquid oils, soft chews, powders, and multivitamin tablets—making it easy to add them to food, though dosing should be weight-appropriate and guided by product instructions or your veterinarian.