The trick in this one is to train a dog to leave food indefinitely. Once in the past, someone threw cooked bones over our fence when no one was home. Understandably, the dogs all chowed down. Problem was, Penny has particularly narrow bowels and is prone to blockages, so this resulted in several trips to the vet before it was cleared up, and a few hundred dollars it would have been nice to spend on something other than fixing a potentially deadly problem caused by someone either being malicious or not knowing any better. We can't be there all the time. Similarly, there is an underground pet trade in this country, and dogs with guard potential especially can be targeted by thieves. I feel like it wouldn't hurt to try to teach dogs to leave food they find lying around. I've heard of people in sheep country teaching dogs not to take poisoned baits they find lying around by putting tobacco in a piece of meat and letting them find it, thus teaching the dog not to eat food it finds lying around. I'm not sure if that's a reliable method, and it also seems pretty extreme to me. Does anyone have any other ideas?