Many giant dogs will not have extremely high energy levels and will not need tons of exercise. In addition, many giant dog breeds are fairly easy to train. The downside is the increased cost of food, supplies and veterinary care. Some giant dogs also have large dewlaps, which causes them to drool quite a bit (their owners often carry a rag around to wipe up all the drool). In addition, many large dogs are more prone to orthopaedic problems or health problems such as bloat. Perhaps most unfortunate is that extra large dog breeds tend to have a shorter lifespan compared to the average canine (around 6-10 compared to the 12-15 years most dogs live).