Glad to hear your little guy is getting to enjoy life again!
Uploaded two short vids to that site.
First one is Doxie today (3/6/18) staggering around on his healing back half. He’s doing pretty good!
Second one is the puppies from a while ago, well, when they were puppies. Just found it and labeled it correctly. Cute little bastards!
Puppehs! Look at Doxie go! Woo-hoo! 
Happy tails all around! The Bunny Hop works well, when needed.
I have a strange craving for Bratwurst for lunch today. Off to Cracker Barrel!
Wow, it doesn’t slow him down a bit. He looks like he could leave you in the dust if he wanted. 
And OMG, PUPPPEEEEEZ!
Doxie walked himself right into the shop tonight. Maybe a one-foot rise over a two-foot run.
Damned Hero.
Yea he is! Give that boy a treat.
Doxie can now ‘jump’ up to try to get into the Jeep. He gets his front feet up on the door sill. I can reach back and hoist him up by his collar into the Jeep (but I don’t do this often).
Freakin’ Hero! Force of Nature!
Strong as shit, and his back is firm and solid. Hope this dog lives another life.
I’m glad to hear it. He must be exercising it good. I read somewhere about their back hip muscles play a part it keeping long bodied dogs backs in good order. Keep him running. Go Doxie Go!!
Yay!
[Leet The Wonder Dog[sup]TM[/sup]'s tail on hearing this]wagwagwag [LtWD’sToht]
Regards,
Shodan
Good boy!
I wish I would have seen this thread earlier. Our dog had a similar problem last summer, but not sure it is the same diagnosis. In the span of a day or two he went from normal activity to paralyzed rear legs, plus crying. The vet was putting euthanasia on the table, but sent us home with some medications (I cannot remember which ones, but probably the ones mentioned in the link in the OP), and we decided since we had drugs, we would give it a try for a while, and see if there were any improvement. Surgery is out of the question due to his age and his experiences with prior surgeries.
That first week was difficult, as we had to help him outside - we used a beach towel as a sling and he did the rest with his front legs (he is 65 lb so carrying him around is not an option). One of the meds upset his stomach early-on and he had a bowel blowout late one night in his crate. 
After a week or so he was able to start moving his legs, and after another week, standing. The vet said as long as progress was being made, stay this course. If there was a setback, bring him in. He continued to improve and eventually he was able to walk and take care of his business on his own. Today he takes a couple of meds daily and some supplements, he is compromised in terms of strength and agility - and has some clicking and popping with his rear legs. He seems to be balancing more on his front legs than before, but rear legs still have decent muscle tone. No more running or jumping, but he still wants to play fetch. Bottom line: he is alive and seems to be happy, and makes us happy every day.
Amazing creatures, aren’t they? Keep up the good care and you’ll probably see him improve every day. Good Luck!
P.S. - Some Epic skiing on the way up at HV in the days to come. Let me know if you’re coming!