I'd gladly post Batatinha's pics if he was my dog, but my cousin would probably get annoyed, it's a privacy matter.

But, basically: picture a huge dog. By "huge" I mean, he probably weights 40kg or so. Mostly black, with some tan; it doesn't follow the same pattern as the Rottweiler or the German shepherd, it's different. Short hair, floppy ears. Rather intimidating, I wouldn't go anywhere close to that dog without my uncle or my cousin nearby.