Are Serrano Peppers Bad For Dogs?

Are Serrano Peppers Bad For Dogs? While bell peppers boost your dog’s immune system and reduce inflammation, spicy peppers are not recommended for your dog. This includes chili peppers, jalapenos, serrano, and even cayenne. Capsaicin is found in many types of peppers and acts as an irritant for dogs. Are spicy peppers poisonous to dogs?