This article is from the Afghan Hound Breed FAQ, by Janis Nixon with numerous contributions by others.
While an Afghan is very much at home on the couch watching TV, he
needs a great deal of exercise or he will become bored. A bored Afghan
can do an unimaginable amount of very unusual damage to a house and
its contents. This cat-like hound will open drawers and remove all of
your underwear for a good chew, climb on the dining room table to go
after a squirrel outside the window or steal tonight's supper off the
top of the fridge. With their powerful jaws they can gnaw through a
chair arm in very little time. A good-sized fenced yard is a
necessity, as the Afghan can trot at speeds of up to 12 mph for hours
on end and not even breathe hard.