After our Yorkie chewed an area rug and the corners of the first step of my hardwood staircase, she started staying in the crate while we are at work. It's not cruel. In fact, when you are training puppies, they are supposed to be put in a crate whenever they are unsupervised. Hell, sometimes when we are home during the day, she voluntarilly goes in the crate to sleep. Just make sure the dog has water available, and don't leave it in the crate for longer periods of time than it can hold it's pee/poop.