Unlike humans, dogs don't need a large amount of fruits and vegetables to live healthy lives. Certain fruits and vegetables do make suitable treats on occasion and can even provide health benefits
Broccoli is high in fiber and vitamin C and low in fat. On the surface, this makes it an appealing choice for dog owners looking for a healthy dog treat, but broccoli also contains a potentially harmful ingredient. According to Dr. Klein, broccoli florets contain isothiocyanates, which can cause mild-to-potentially-severe gastric irritation in some dogs. He also states, "broccoli is considered safe in dogs if the total amount ingested is less than 10 percent of their daily intake. Over 25 percent is considered toxic." Ten percent of a dog's diet means very different things for different breeds of dogs. Dr. Klein also reminds dog owners that every dog is unique. Some dogs might react more strongly to broccoli than others, so it is very important to monitor individual dogs to see how they react to broccoli or any new food item.