I just got a sanding block (one of those you can attach different grits of sand paper to) and went to town on the edges. More or less though it just knocks off the "sharp" 90 degree angles on the edges. Without a machine sander I doubt anyone would be able to have enough elbow grease or muscle, not to mention patience, sitting there hand sanding the edges to make them round. I also sand down the damage that they do while chewing about once a month or so. Course, that's not totally needed either, cuz they'll just do it all over again.I have a question, do some people not sand down the corners? All the shelves I have purchased always have the corners rounded. I would love to make my own shelves but I don't know how I would be able to round the corners
And just like someone up there said...it's a personal preference...not a necessity.