In dogs, mitral valve disease primarily involves the degeneration of the mitral valve, which separates the left atrium from the left ventricle. This condition is particularly prevalent in older dogs and certain breeds, such as Cavalier King Charles Spaniels and Dachshunds. As the valve deteriorates, it may fail to close properly, causing blood to flow backward into the atrium, a condition known as mitral regurgitation. Over time, this can lead to an enlarged heart and congestive heart failure, significantly impacting a dog's quality of life and longevity. The progression of mitral valve disease can vary between individual dogs. Some may exhibit symptoms such as coughing, difficulty breathing, or exercise intolerance, while others remain asymptomatic for extended periods. Regular veterinary check-ups are crucial for early detection and management of this condition, as intervention can help slow its progression. Advances in veterinary medicine, including the potential for new geroscience compounds, may offer hope for improving heart health and extending the lives of affected dogs, aligning with the growing understanding of aging and disease management in canine care.