Corgis really don't yap. However, speaking from experience, they are big dogs with small dog legs. They are a working breed, originally used to herd sheep and cattle, and they have the working breed tendency to get neurotic and destructive when they are not given enough to do, though they tend to settle down as they age. (Ours handled this by running laps around the backyard. For hours.) That being said, they are so damned smart, so if you can teach them a new trick about every two weeks or so, and work with them on these tricks every day so that they feel as if they are accomplishing something (treats optional)? They are an absolute delight to be around. The only trick with them is to make training a game.