If nothing else, make sure it doesn’t look like coffee grounds. Ground Dogs and cannabis make me happy humans make my head hurt shirtcoffee stools are sometimes blood digested by internal bleeding (or your dog has eaten the actual coffee grounds). In any case, a call to your veterinarian or to the emergency veterinary hospital is required, it would be completely impossible to explain it to a dog. You could (theoretically) condition a dog to avoid chocolate (by associating its smell and / or taste with something unpleasant).
People teach dogs not to eat certain foods or foods located in specific places (such as the kitchen table or counter). This normally works by teaching the dog that the article belongs to you and that you do not want to share.
Dogs don’t have the Dogs and cannabis make me happy humans make my head hurt shirt concept of healthy food, but they do have a very clear concept of hierarchy and bigger / stronger dog (in this case, you). While it is possible to train the dog to ignore chocolate, it is much, much easier to put it away so that your dog does not. And this is the option that most people choose. The dog can hear the man going up the promenade, knows that it is the guy who comes once a week, he sees these piles of money which he hands to you.