Molosser is a category of solidly built, large dog breeds that all descend from the same common ancestor. The name derives from Molossia, an area of ancient Epirus, where the large shepherd dog was known as a Molossus.

Molosser is a category of solidly built, large dog breeds that all descend from the same common ancestor. The name derives from Molossia, an area of ancient Epirus, where the large shepherd dog was known as a Molossus.