A German breed that is known for intelligence, herding instincts, loyalty and obedience to it's family. Their creation goes all the way back to the Roman Legion in the middle ages who bought dogs in a small town market of Rottweil to herd the army's cattle. Rotteweilers are a domineering breed and needs an experienced owner and handler.
http://www.akc.org/breeds/rottweiler/index.cfm
http://en.wikipedia.org/wiki/Rottweiler