4. Beagle
Beagles are celebrated for their robust health and enduring nature, often living up to 15 years. These spirited dogs are known for their friendly demeanor and boundless energy, which keeps them active and healthy. Their strong immune systems and resistance to many common canine ailments contribute to their longevity. Beagles are versatile and adaptable, thriving in various environments, which makes them a popular choice for families seeking a hardy and long-lived canine companion.