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Hello, I am sorry to hear about Jack. Thanks for requesting me; sorry I was not online at that time.
If he is showing some improvement, he may continue to slowly get better, but it is also possible that some nerve damage is irreversible. If my own dog had this problem, I would work with a rehab specialist. There are veterinarians who do things like physical therapy, acupuncture, etc. to help paralyzed dogs.
I would ask the surgeon at the practice where the surgery was done for a referral for a rehab veterinarian in your area. There are no good braces for dog back legs. The legs are wider at the top and narrow at the bottom, so things like braces tend to slide down and do no good. Prosthetics are sometimes made for dogs that have lost a leg, but if he has all four legs he does not need a prosthetic.
The wheelchair is what I would use until he is using both legs.