Carrots are extremely low in calories, which is great news if your dog is diabetic or overweight. Carrots are beneficial for dogs, both raw and cooked, and provide a nutritious boost to their diets. When eaten in moderation, carrots are a low-calorie, healthy treat.They do, however, contain a lot of natural sugar, much like other fruits and vegetables. This is why dogs find them so enticing. However, excessive sugar, albeit natural sugar, can lead to weight gain and other health issues.