Song Dynasty style buying Ccizhou-ware Chinese ceramic pillow reproduced in cat form.

This measures approximately 9" long and 5 buying 1/2" wide
This piece is from the American Heritage Museum and is signed with symbols between the eyebrows.
It's primary use was to make sleeping comfortable. In warm weather, fill with cold water, and in cold weather fill with hot water. I guess you had cork or something to use as a plug.