1) Preventive nutrition through ideal weight maintenance and evidence-based supplements can help prevent many common diseases in pets. 2) Maintaining an ideal weight through calorie control, exercise and expert assessment can help dogs and cats live 15% longer on average with fewer health issues. 3) Supplements like fish oils, joint supplements, and probiotics have evidence to support their use in treating diseases like osteoarthritis, inflammatory skin conditions, and kidney and heart disease when used under veterinary supervision.