Only a pet lover would understand this!
Back in the sixties there was a band named “3 Dog Night” which borrowed the name from ancient times when owners would let their dogs sleep on the bed for added warmth. A very chilly night warranted sharing your bed with no less than 3 canines!
True pet owners still keep the tradition alive, but to preserve your duvet and sheets, place an old sheet on top of duvet to catch the hair and muddy paw prints. Shake the sheet outside in the morning and leave it to air during the day, otherwise you make start looking and smelling like your pet!