They don't just spend time playing fetch and getting belly rubs, though. Jake and Boo are also philanthropic.
A recent fundraiser for the Mississippi Animal Rescue League featured an auction for celebrity-autographed wooden dog bones. The cut-outs, which also featured a paw print from the celebrity pup. The AP said:
"...some celebrities included personal messages or photos with the bones.
Gyllenhaal has often been 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."
Sounds like a great cause and a great collectible. Jake and Boo weren't the only big names involved. Dog owners ranging from John Travolta to James Caan participated with their pooches.