Once you’ve picked the material for your crate, size is the most important remaining consideration. Since dogs descended from den animals, most like to have a confined place they can retreat to for quiet and solitude. Or course, dog crates, like dogs, come in a wide variety of sizes. Many people worry about their dog’s comfort and get a crate that is too large. That nearly always leads to problems. If the crate has more room than just enough for your dog to stand up, turn around, stretch out and lie down, he or she is liable to use part of the crate for sleeping and lounging, and the other part of the crate for pooping and peeing. In a crate that is perfectly sized, a dog will seldom relieve himself since that’s where it will sleep. If you’re buying a crate for a puppy, it’s not bad to buy a crate that will fit it when it’s full grown. Many crates come with dividers so you can make the crate grow as your puppy does.