I had this moment with my boy a few weeks ago! Never had ridden his canter, we went to PC and were out in a big paddock/parking area for our flatwork. Instructor asked if we wanted to canter and I went 'what the hell!" Asked for it, got both legs correct, and pulled up really easy :) That was his 5th ride after coming off the track! (after a 12 month spell)
The he had a few weeks off from an infection caused by tick bites.
Our second canter was a few days ago, out in the 10ac paddock.. We got video proof!