The Dog Aging Project is an innovative research initiative that brings together a community of dogs, owners, veterinarians, researchers, and volunteers to carry out the most ambitious canine health study in the world. The Dog Aging Project team will follow tens of thousands of companion dogs for ten years or more in order to identify the biological, lifestyle, and environmental factors that maximize healthy longevity. We expect to gain insights that will increase our ability to prevent, diagnose, and treat age-related diseases, thereby helping our dogs, and by extension, ourselves, live longer, healthier lives.