My Akita used to apply a "thirty second rule" to food left unattended on a TV tray.
I had left a nice hot ham sandwich on the TV tray and was rooting around in the cabinet for a video tape when Elsa the Akita made her move. She walked past the tray very nonchalantly, and with a move that was so smooth I couldn't believe it really happened snatched the sandwich up en passant. She even had the sense to carry the thing in the side of her mouth facing away from me so I couldn't see it.
I really should have yelled at her, but frankly, I was so impressed with very un-doglike stealth and precise execution of Operation Hamsnatch that I just made myself a new one. And was always careful thereafter to give the dog her dinner before making mine.