Reddit mentions of Kuranda Walnut PVC Chewproof Dog Bed - Large (40x25) - Cordura - Smoke

I don't know if this will work. I haven't used it personally but I heard it was good for dogs that chew beds

https://www.amazon.com/gp/product/B004E2JVKK/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B004E2JVKK&linkCode=as2&tag=rove05-20&linkId=5b1d4e4df1b5b696c902eadc1d9d8078

yes it's called a kuranda bed and all of my dogs have loved them! I ordered them on Amazon. They are so much easier to clean than a stuffed bed. now that my cat has discovered them, he gets on there too!
Kuranda Walnut PVC Chewproof Dog Bed - Large (40x25) - Cordura - Smoke https://www.amazon.com/dp/B004E2JVKK/ref=cm_sw_r_cp_api_7K0nyb05T2EA7

We used to add a bit of canned pumpkin on top of our dogs regular food with some glucosamine in it. Once you open the can you can keep it in the fridge for about a week I think, and they were like 1.50$ or so for a large can. Pretty economical, tasty, and good for the dog's digestion. Just make sure not to get the pumpkin pie filling, because it has added spices and sugar, but just the plain pumpkin puree.

Sorry to hear about your golden showing signs of hip problems :(. If you got your dog from a breeder it might be worth mentioning it to her/him just so they are aware of the problem if they are still breeding. And I'm not sure if your vet has told you (ours didn't) but there are a lot of little things to do around the house to help keep your dog's hips in better shape. Things like adding mats to any slippery wood or tile floors (less stress on the hips than if they were slipping), adding stepping stools if your pup jumps up on the bed or couch and beds similar to this one which are supposed to put less stress on the hip when the dog is sleeping.

We use an elevated pet bed for outside the crate (https://www.amazon.com/Kuranda-Walnut-PVC-Chewproof-Dog/dp/B004E2JVKK/ref=sr_1_11) which is nice for when we can watch her, and is also supposed to be good for the joints of large breeds.

For inside the crate, we are sticking to towels until she can be trusted not to chew them. We imagine it'll be 9-12 months before she's ready for that.

Nothing is going to be both cozy and chew-proof. The two are sort of inversely correlated, so you just have to choose the level you can handle. At max durability and minimum coziness are raised beds like this. Slightly comfier but more vulnerable are beds with tough exteriors and soft interiors like this.

What I've settled on with my nutcase is this incredibly cozy, plush, and actually quite durable mat. It's nice and thick and certainly warm for winter, and machine washable. Not as durable as the previous two, but they outlast any other soft bed I've gotten her. The good part is that it's really hard to tear up, so she can only do a tiny bit at a time, and it's made so that if a little piece is torn off it doesn't mean the whole thing is ruined. I just sort of accept that I'll have to spend another $35 every 6 months or so when she's pulled enough of it apart that it's not really functional anymore. Way better than with all the other soft beds, though! I will say that that amount of time gets longer as your pup grows up, too - Tess was a destroyer at 6-14 months or so, but hardly at all now at 20 months.

I approached this from the direction of offering things that aren't really appetizing. Check out a bed like this:

https://www.amazon.com/Kuranda-Walnut-PVC-Chewproof-Dog/dp/B004E2JVKK