The show will pay homage to Barker throughout the week of Dec. 9-13.
"Each day, the show will feature pet adoptions, a cause dear to Barker's heart, leading up to his big day, Thursday, Dec. 12, when he'll surprise the studio audience with a rare appearance and present a special showcase," CBS said in a news release.
Drew Carey has been the show's host since Barker retired in 2007. Barker started out on the show in 1972.
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