He's really thin and muscular like a greyhound too. The humane society didn't really know what he was, but I googled boxer/greyhound mix and it looked like him. A lot of people think he's a pit, in fact he got kicked out of my apartment complex and had to live with my grandma until my lease was up because they thought he was a pit and wouldn't believe otherwise since he's brindle and muscular. I've only met one pit that was even worth being partially afraid of and it was chained up outside its whole life. If you treat 'em right, they are good dogs! /rant