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Can Dog Eats Oreos - Why Are Oreos Bad for Dogs? | PetsFoodNutrition No. If your dog has only had one Oreo, she should be alright. Oreos, on the other hand, are not suggested for dogs. Of course, dogs get poisoned by chocolate, but there isn’t enough baking chocolate in one Oreo to cause concern. However, feeding your dog anything with even a trace of a harmful chemical is not a good idea.