I'm surprised it's harder to get your dog certified as a service dog.
Dr. John Cory is a very good foot and ankle doctor that might help. He's not perfect. He's rude at times, but did good work for me. He prescribed me Ketamine/Tramadol cream for my ankle, which helped some, but it's not a cure all and Percocet works better. He might suggest a different approach for your ankle. I don't know who your doctor is but some of these doctors are terrible and should have no business being doctors at all.
Hopefully, you don't go to any of these people:
Terrible doctors in the Phoenix area:
- Anna Natcher (meh)
- L. David Richer (lazy and self-centered: avoid at all costs)
- Adam M. Kruczay (actually twisted my ankle HARD during an exam and gave me a half-assed apology)
- Brett Roeder (misdiagnosed me stating that he was 100% sure (he was 100% wrong), then he charges me almost twice as what everyone else charges, so I refused to pay him)