No, it’s not essential to keep the bed at a constant temperature. However, you need to make sure that the temperature doesn’t get too high - any recklessness in this regard and you expose your pooch to a burn. That’s why we always suggest keeping a heated dog bed in the same room as you are - or better yet, don’t turn it on at night. A rule of thumb is to keep it on when you’re awake and once your pooch gets warm, turn it off before going to bed!