Rott·wei·ler 
(rŏtwī′lər, rôt-)
(rŏtwī′lər, rôt-)n.
A dog of a large breed developed in Germany, having a muscular body, a broad head, and a short black coat with tan markings on the face and legs.
[German, after Rottweil, a city of southern Germany.]
Rottweiler