I think this kind of training is utter nonsense almost certainly based on an irrational fear that someone is going to try to poison your dog. ([EDIT]- or maybe based on the archaic view of dominance theory and "alpha" role in providing food.) I'd flip the script and say a much more rational approach is to responsibly protect your dog from such situations in the first place. Don't keep them chained up in the back yard. Contain them in your house when you leave.
If you're afraid of someone breaking into your house and giving your dog poisoned meat, I'm afraid you have much bigger issues than that.
I just don't think this sort of training has any realistic value at all. Now training your dog to not eat random things it finds on the floor, like- dropped treats on an agility field, for example- is an entirely different thing.
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Last edited by wildo; 04-02-2013 at 06:10 PM.