As a dog owner of a dog who has IVDD I can't stress enough how important the crate has been for us and still is.
As a puppy we did a half arsed attempt at crate training which helped until we felt confident enough that he wouldn't hurt himself when we weren't around.
Age 2 he suddenly became paralysed in his back legs. It was absolutely awful to watch and we thought we had lost him. A disc in his spine had exploded and he had to have an 11 hour surgery! This was followed by 8 weeks of crate rest. He was allowed out of the crate several times a day to toilet in which we had to carry him outside and back in again. We invested in every enrichment toy that we could find, we had friends drop off rags their dogs (our dogs pals) had slept with etc so that he didn't get bored.
We spent hours a day doing rehab exercises, massaging and eventually when he was allowed taking him to hydrotherapy
6 months later the same thing happened again!!!
He's 4 now and he's a happy little doggo! He enjoys his walks and playing in the garden and it's lovely to see him up and about, but his life will never be the same as it was before he was diagnosed with IVDD, same as people with disabilities our boy will always be more fragile and for his own good he still goes into the crate when he's not supervised.
I can tell you what he does for the 4 hours that we might not be at home... he sleeps... on his side (the only time he sleeps on his side is in the cage because that's where he feels safest) I know this because I watch him on a camera.
When he's tired, overwhelmed or wants a bit of space he takes himself off to his crate even when are home, the only difference is when we are home we do not close the door.
When you are caring for a dog with specific needs then need to do make adjustments to meet those needs just as you would for a child for example. Please if you have no experience in caring for a disabled dog just keep your shitty opinions to yourself, we are already living with guilt and fear of relapse!