What does "house dog" mean?

A dog used to protect a house, a watchdog; (later also) a dog kept as a pet.

What is a synonym for "house dog"?

Common synonyms include: corgi, domesticated dog, housedog.

noun

noun ·Rare ·Advanced level

Noun

1
A dog used to protect a house, a watchdog; (later also) a dog kept as a pet.
"The house-dog, with the vacant greyhound, lies, / Out-stretch'd, and sleepy."

"The house-dog, with the vacant greyhound, lies, / Out-stretch'd, and sleepy."

From house + dog.