Personnaly, I won't allow my horse to canter uphill, but
prefer a gentle slow trot with the head on the ground or even a walk. Question
of energy sparing.
From:
"A. Perez" <walkergirl@xxxxxxxxxx>
Subject: [RC] trot vs canter
For what it's worth, if
given his head while going up a steep
hill, my gelding will almost always canter rather then walk,
rack, pace or trot, so I assume that of all the gaits he can
choose from, cantering is easiest, at least up hill.