Doss connected with Cameron Montgomery for a 13-yard play on third-and-9, then a face mask call gave the Tigers a critical first down after it appeared the Wildcats had made a stop.
Walker then finished it off with a 9-yard run on fourth down with 22 seconds to play.
The Wildcats will close out the season Thursday night at home against East Central.
PRCC GAME SUMMARY
Saturday at Poplarville
Northeast 26, Pearl River 23