Did your Vet recommend supplements?
I have Phoebe on Cosequin as so many others here do and have seen wonderful results in her gait as well as less pain. Limiting her walks to a minimum distance and steps off of beds & couches have been beneficial too. I have actually taught her now to sit stay on my bed in case I have to run out to the kitchen for a midnight fridg raid for cookies & milk...lol!
Here is a link to Cosequin and I would ask your Vet about starting Thor on this asap:
Cosequin DS for Dogs & Cats - Cosequin Chewables