All very good untill someones dog dies or worse still your dog.
DO NOT AGREE WITH THIS METHOD AT ALL.
Most of the time a fox will just take away the food and bury it somewhere. it's so easy for your dog to find it later then it's too late.
WHAT A BAD PIECE OF ADVICE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!