German shepherd dog vs German shepherd

German shepherd dog and German shepherd both are nouns.

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

As nouns, German shepherd dog and German shepherd are synonyms defined as:

German shepherd dog and German shepherd: breed of large shepherd dogs used in police work and as a guide for the blind

Other synonyms of German shepherd dog include alsatian, German police dog.

German shepherd dog (noun)	German shepherd (noun)
breed of large shepherd dogs used in police work and as a guide for the blind	breed of large shepherd dogs used in police work and as a guide for the blind