Super news, I'm sure you were glad to hear that!
Just FYI, my vet told me Shelties tend to get arthritis in their wrists - Faith certainly has that unfortunately. You mentioned starting supplements - I use Vibrant Pets Joint and Muscle (an American company, human grade ingredients. I've spoken to the owner, who is a Veteran), and for Omega 3's which help with arthritis, Super Snouts Joint powder. It worked so well for Brooke that I started taking human version of green-lipped mussels myself.
Neither one is super expensive. Super Snouts is on Chewy and probably Amazon, Vibrant Pets has their own website.