The Irish Wolfhound is the largest dog in the world often standing over 7 feet tall on his hind legs. The were originally bred as war dogs, then hunting dogs, and now are gentle giant family dogs. They are gentle giants, love children, and make great family pets. They can be inside dogs but need a good walk to stretch those long legs. They are quiet and friendly. If you want a BIG dog to keep inside, the Irish Wolfhound is a good choice.