The problem with this is that because dogs are contextual learners your dog would probably learn not to eat the hot dogs when you were present but when you weren't he'd do as he pleased. If you're training this just for food refusal at competition then the leash and collar method would work just fine since you're going to be present during that competition.Patrick Murray said:
If you're doing this for the purpose of poison proofing I'll suggest that in reality there's little need for it and it's quite hard to train and just as hard to maintain.
You could do it this way but you might get some fallout. He might become afraid of the back yard. If a butterfly happened to flit into his field of view, he might become afraid of butterflies.
I'd suggest that you first train the dog, usually two behaviors are all that's necessary with the Ecollar. The \"how to\" is on my website in the articles section. This uses low level stim where the dog first feels it. It teaches the dog that when the stim starts he's wrong (in the sense that what he's doing isn't correct) and that when it stops, he's done the right thing.
When this is clear to the dog you can use it at just slightly higher levels to train him to stay away from the hot dogs. Then you can proof at higher levels without fear of fallout.