Leonberger University of Bern, Bern, Switzerland In the 1830s, Heinrich Essig, a dog breeder and seller and mayor of the town of Leonberg near Stuttgart in Baden-Württemberg, Germany, claimed to have created the Leonberger by crossing a female Landseer Newfoundland with a "barry" male from the Great St. Bernard Hospice and Monastery (which would later create the Saint Bernard breed). Later, according to Essig, a Pyrenean Mountain Dog was added, resulting in very large dogs with the long, white coats that were the fashion for the time, and pleasant temperament. The first dogs registered as Leonbergers were born in 1846 and
St. Bernard (dog) St. Bernard breed has been ever refined and improved using many different large Molosser breeds, including the Newfoundland, Great Pyrenees, Greater Swiss Mountain Dog, Bernese Mountain Dog, Great Dane, English Mastiff, and possibly the Tibetan Mastiff and Caucasian Ovcharka. Other breeds such as the Rottweiler, Boxer, and English Bulldog may have contributed to the St. Bernard's bloodline as well. It is suspected that many of these large breeds were used to redevelop each other to combat the threat of their extinction after World War II, which may explain why all of them played a part in the creation of the