6. Maltese
The Maltese, with its silky white coat and gentle disposition, often lives up to 15 years. Their calm and affectionate nature contributes significantly to their longevity, as a stress-free life often correlates with better health outcomes. Additionally, Maltese dogs are less prone to severe genetic disorders, which supports their extended lifespan. Their small size also facilitates a longer life, making them a beloved choice for those seeking a serene and long-lasting canine companion.