If you’ve ever been frustrated because your house smells a little too much like your pets, it might be because you never wash your pet beds. Think about it: Most people wash their sheets at least once a week (Martha Stewart recommends every other day, but who has the time — or the household staff — for that?). When we don’t wash our own bedding regularly, it starts to smell, well, stinky from an accumulation of body oils, hair, perspiration, dead skin cells and bacteria. It’s