St Bernard is one of the largest dog breeds in Watergate among the known dog breeds. Saint Bernard dogs generally weigh 60- 120kg, and the shoulder height is about 65-80cm. Its watergate size is proportional to its size, so it can be said to be the "big MAC" among dogs. In addition to St. Bernard, Newfoundland and other large dog breeds also have larger watergates, but they are still not as big as St. Bernard. It should be noted that the size of the Watergate does not represent the quality or humanity of a pet dog. As a pet owner, we should pay more attention to the health and personality of pets, rather than specific signs.