Well there you go, the food is the answer. Lots of things humans eat are toxic to animals so all you got to do is order like a bunch of coffee, chocolate, avacados, onions, garlic, maybe some potatoes you leave in the sun awhile... Get some turkey or other meat and stuff it with all the potentially toxic treats and hope something sticks.
You probably want a very large quantities of those things. Even if chocolate somehow is poisonous to them, a Hershey bar ain't going to do it for something that big.
I had a German Shepard that ate a whole pan of brownies with chocolate chips and broken glass in it, once, and it didn't even affect him. I was afraid he was going to die, but he ended up being perfectly fine.