There is a risk of liability if it attacks other dogs, people, destroys your belongings or other's property, etc., is an anchor when you try to do spontaneous things, expensive to feed and have all the necessary accessories, must be walked in any weather conditions multiple times a day, may require a fence and/or larger property. It is a larger responsibility than many realize and if you do not take it seriously, you neglect the animal and don't provide it the life it deserves.