Boston Terriers can be scrappers, too. My neighbor had a male one back in the late 1980s (cool little dog), and he'd let him out with him loose. One day, I came out my front door with my 85 pound Doberman on a leash, and that little SOB charged him, jumped up, literally latched onto my Doberman's throat, and was hanging by his grip, no feet touching the ground. To get him off, my Doberman crashed down on him with his full body weight and crushed him till he had to let go. Then his owner grabbed him up and apologized. No blood drawn, though.