sausage dog vs dachshund

sausage dog and dachshund both are nouns.

Word	Noun	Adjective	Verb	Adverb
sausage dog	Yes	No	No	No
dachshund	Yes	No	No	No

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

sausage dog: informal term
dachshund: small long-bodied short-legged German breed of dog having a short sleek coat and long drooping ears; suited for following game into burrows

Other hypernyms of sausage dog include badger dog, dachsie.

sausage dog (noun)	dachshund (noun)
informal term	small long-bodied short-legged German breed of dog having a short sleek coat and long drooping ears; suited for following game into burrows