Rottweiler vs shepherd dog

Rottweiler and shepherd dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rottweiler	Yes	No	No	No
shepherd dog	Yes	No	No	No

As nouns, shepherd dog is a hypernym of Rottweiler; that is, shepherd dog is a word with a broader meaning than Rottweiler:

Rottweiler: German breed of large vigorous short-haired cattle dogs
shepherd dog: any of various usually long-haired breeds of dog reared to herd and guard sheep

Other hypernyms of Rottweiler include sheep dog, sheepdog.

Rottweiler (noun)	shepherd dog (noun)
German breed of large vigorous short-haired cattle dogs	any of various usually long-haired breeds of dog reared to herd and guard sheep