Oprah Winfrey, Donald Trump, John Travolta and Jake Gyllenhaal are among 40 celebrities who have signed wooden "dog bones" for a charity auction benefiting the Mississippi Animal Rescue League.

The celeb-signed bones will be auctioned off Thursday at the organization's second annual Fur Ball event. Proceeds will go to constructing a new animal shelter, said Allison Nutt, a MARL board member and chairman of the Fur Ball event committee.

Nutt said some celebrities included personal messages or photos with the bones.

Gyllenhaal has often be photographed walking his dogs, Atticus, a German Shepherd, and Boo Radley, a puggle. The actor's autograph was accompanied by his dogs' paw prints, Nutt said.

Mariah Carey signed the bone and added her pooch's name, Jack, as well.

Other celebrities who signed bones include Matthew McConaughey, James Caan, Leann Rimes, Betty White, Dr. Phil McGraw, Eric McCormack and "Dog Whisperer" Cesar Milan.

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