History of the Saint Bernard Dog.
The ancestors of the St. Bernard are the herding dogs of Swiss farmers like the Greater Swiss Mountain Dog, as well as hunting dogs and watchdogs. Their history has also been connected with the hospice at the Great St. Bernard Pass. First reports of the dogs' presence at the pass date to the 17th century, and they remained loyal companions to the monks there.
The most famous St. Bernard to save people at the pass was Barry (sometimes spelled Berry), who reportedly saved somewhere between 40 and 100 lives. There is a monument to Barry in the Cimetiere des Chiens, and his body was preserved in the Natural History Museum in Berne [1].

The classic St. Bernard looked very different from the St. Bernard of today, because an avalanche killed off many of the dogs used for breeding[citation needed]. To further the breed, they crossed the remaining dogs with other dogs, but in the process lost much of their use as rescue dogs. The St. Bernard is among the heaviest and largest dog breeds in the world. The heaviest and largest dog in known history was a Saint Bernard named Benedictine, which weighed 152.5kg (336 lbs).[2] Successive studies suggest that Benedictine was in fact 162 kg (357 lbs).