St Bernard is a breed of large dogs that originated in the Swiss Alps and are known for their loyalty and intelligence. The breed is also referred to as the Alpine Mastiff, the Sacred Dog of Tibet, and the Swiss Alpine Dog. St Bernards are famous for their rescue work in the mountains, where they have saved many lives by searching for lost travelers or people caught in snow slides. The breed's size, strength, and intelligence make it an ideal choice for search and rescue work. Despite their impressive size, these dogs are gentle, affectionate, and loyal pets, making them a popular choice for families and dog lovers.