There are some foods that dogs should never eat, but when they eat brussels sprouts, there is no inherent risk involved. In fact, these nutrient-dense vegetables can be a healthy addition to your dog’s diet, in moderation, of course, and may provide some surprising health benefits.
Can Dogs eat Brussels Sprouts?
Dogs can certainly eat brussels sprouts, but they should only be eaten occasionally, and only when prepared in certain ways. Most dogs are on a strict diet of dog food, which is specially designed to provide all of the nutrients your canine companion needs. However, it is almost inevitable that you’ll give your dog some food from your plate at some point or intentionally supplement their diet with healthy human food.
When it comes to brussels sprouts, most people prepare them by sautéing or frying the vegetables, braizing them in bacon fat or adding more ingredients to improve the flavor. If this is how you prepare your brussels sprout, it may be best to avoid giving them to your dog. Raw brussels sprouts are perfectly fine for their health, as are cooked brussels sprouts that don’t have excessive amounts of oily or fatty foods cooked along.
The good thing is that brussels sprouts are high in dietary fiber, vitamin K, vitamin A, and vitamin C, as well as various minerals, such as potassium and manganese. With a relatively low-calorie count and various antioxidants that can reduce inflammation and oxidative stress, particularly in aging dogs, brussels sprouts can deliver quite a few health benefits when fed in moderation. 
What happens if Dogs eat Brussels Sprouts?
If dogs eat brussels sprouts, similar to when humans eat these little vegetables, there will be a few gastrointestinal side effects. First of all, brussels sprouts are legendary for their effect on flatulence, so your dog may be a bit stinkier if he eats a few pieces of brussels sprouts. Eating too many brussels sprouts will cause serious stomach problems in a dog, namely diarrhea, loose stool, or stomach discomfort. 
The best way to approach giving your dog brussels sprouts is to start with a small amount and then slowly work your way up, perhaps once a week, but not more than that. If your dog shows any negative side effects at any time, scale back or maintain the quantity of this nutrient and antioxidant-dense vegetable you choose to give him. There are also many other vegetables that should be alternated in your pet’s diet if you are intending on occasionally using human food as a treat.