Understanding the Risks Feeding your dog the wrong foods can lead to serious health issues. It's essential to be aware of what can harm them. This guide will help you navigate the dangers of certain foods and keep your pet safe. 1. Chocolate Chocolate is widely recognized as one of the most toxic foods for dogs. It contains theobromine, which can cause severe health issues. In fact, a small dog can experience toxicity after ingesting just a couple of ounces of dark chocolate.