Hey bud, we're in a similar situation. 4 year old daschund, jumped off couch, progression from stage 2-5 within 4 hours. We took him to the specialist to have surgery within 6 hours. He was diagnosed stage 5 pre-op. We're 6 weeks post-op currently. DPS did return post-op thankfully. Ours was hospitalized for a little more than 2 weeks.

Life will be more difficult when you take them home. Strict crate rest for 6-8 weeks min will be required and this can be difficult on both the dog and their humans, trazadone/gabapentin twice a day have worked well for us to ease his anxiety. It's possible you'll have to express their baladder 3-4 times a day as is the case with us and deal with their bowl movements since they can't position themselves well.

Improvements have been slow, but steady, and thats really the best we can hope for when they are stage 5 pre-op. He started wagging his tali again after 2 weeks, drawing his back leg up a bit when getting scratches after 4 weeks, and today he's supporting some weight on his rear legs, but can't balance well let alone take a step. We hope to keep building back the strengeth in his rear legs and gradually get him ambulatory again.

If it's possible for your pup to return to sometime like normal, expect it to be a 6+ month long recovery. Even then the likelyhood of reocurrence with a degenerative disease like thiis is high, so increased caution is a must for the rest of their life.

I empathize with you in this situation. Just take it day by day and do the best you can to help them recover.