What kind of dog is it ?
Does the dog have any other health concerns at the age of 10years old.
You need to be realistic , if you taking an older pet of a large breed dog the life span is not that much longer then 12, seriously speaking the aesthetic given to older pets usually in my experience: and happens within 3 to 6 months if not immediately creates stress on the animals body and they usually can pass away from the anesthesia .
Spinal operations unless done at a specialist facility such as Davies near Leighton area or where it specializes I wouldn't let anyone or a regular local vet do a spinal operation on my pet.
The other alternative is to contact the varsity for vet college and ask them if they able to help out. My cousin works there , they do offer free treatments to special cases for study purposes.
The thing one needs to look at your pets recovery and if your father is wheelchair bound , will your pet he able to get the help or care needed, post operatively?
I have seen some cases where the owners have used alternative methods to help and the dogs have come right, without surgery. These include being on a long term anti flam Med, and massage therapy on the spine and using a gel which used for horses , which can be bought at a vet or pet supply shop and a lot of humans use it too for pain relief.
Or consult an animal Physio or acupuncture or pet ciro , they do exist in the U.K. And have had a lot of success, personally I would go this route for my own pet if I was in your situation, as I am not a fan of old pets going under anesthesia .
Also diet : do not let your pets become fat, walking down a flight of stairs if they over weight or jumping off the couch at a wrong angle can easily slip their disc out for example in small dogs like daschunds .
Good luck and pray for your pets recovery. X