Great Swiss Mountain Dogs are very large active working dogs, and just like any breed of huge dogs, it should also be trained how to socialize in its early life stages. This breed is basically even tempered and a good family dog. You should pay attention to its health as Greater Swiss Mountain Dogs carry the genes to produce epilepsy. They may also suffer from bloat and hip dysplasia. Although no information exists on the average lifespan for this breed, it is essential to take care of them in the best possible way to keep them healthy and active.