watchdog vs housedog

watchdog and housedog both are nouns.

Word	Noun	Adjective	Verb	Adverb
watchdog	Yes	No	No	No
housedog	Yes	No	No	No

As nouns, housedog is a hyponym of watchdog; that is, housedog is a word with a more specific, narrower meaning than watchdog:

Other hyponyms of watchdog include kuvasz, attack dog, schipperke, pinscher.

watchdog (noun)	housedog (noun)
a dog trained to guard property	a dog trained to guard a house
a guardian or defender against theft or illegal practices or waste