The fish sleep in their fish tank, the rabbit sleeps in his hutch. When it is cold I wrap a blanket around the hutch to keep drafts out.
We'll get a dog later this year and the dog will sleep outside. On a truly awful night I'd let it sleep in the laundry. Our dogs in the past have slept in crates but I'm not sure we'll have room for a dog crate. No animal will ever sleep in my bed.