If a dog eats black pepper, you need to observe the dog's condition. If vomiting, diarrhea or other abnormal reactions occur, you need to send it to the pet hospital for treatment in time. If the dog has no abnormality, you need to give the dog more water to speed up the treatment. Dog metabolism. Dogs cannot eat irritating food. If they eat too much, it can easily cause food poisoning and other reactions in dogs.