What was a "dog-room" in 1847 (or 1773)?

[Joel S. Berson]

In a story published in America in 1847, I have the following sentence:

"The furniture, though evidently of an age anterior to that of the
inhabited part of the house, was of a style and description better
befitting what our ancestors used to call a "dog-room" than a bed-chamber."

The story itself is set in 1773, and describes a house in South Carolina.

"Dog-room" is not in OED2.  What does it mean?

Joel