37kg Ted has a giant bed that he uses for part of the day (around 4ft x 2 1/2 ft), but at night it’s become the domain of our 6+kg CHONK ex feral cat we adopted last year, with Ted sleeping of the rug next to it! It’s still large enough for him to stretch out fully.
Ted spends winter as his full, long haired self, and likes to sleep either on our wooden floors downstairs or on the leather sofas (they’re old & both covered in a multitude of crocheted blankets).
I’ll probably be judged as a terrible, dog owning slattern for allowing him on the sofas (and for his bed being in our bedroom) but he sleeps where he wants to sleep.
At the moment I’m about to start work (from home) and his giant, stinky self is stretched out at my feet on our king sized bed. I have a disability, hence still being on the bed with him as I type!
Dogs sleep where they want to sleep. If they like a pile of blankets, then I’d stick with that, but maybe adding some extra padding or vet bed underneath. Our old dog was larger than Ted, but would curl up around my DH’s neck on his pillows at night, or sleep between us as a long (although the dog would eventually turn into his side and use he feet to push me out of the bed to have more room lol).
And yes, all bedding, dog or otherwise, is washed every few days, and I’ve forgone hairdressers myself for the last 14 years so I can spend an absolute fortune on regular dog grooming! They’re doods, so regular grooming is vital (along with daily brushing & interim baths), and tomorrow I’ll be paying for Ted’s at a good chunk of £100.
I do find that blankets are easier than trying to clean huge beds & covers (his is waterproof so is hosed down in summer & left to dry on the patio). I just chuck the blankets in the washer, and can easily wash, tumble & replace them within a day. Vet bedding likewise (with a couple of balls in the dryer to re-fluff them).