I'm part loaning a lovely gentle cleveland bay 10 year old gelding. He's a sweetie in every way, but trips and stumbles when we're hacking out (cinder tracks mainly) he had an abscess on his hoof before I started my loan, which the owner assured me is fully healed and he's sound. He's unshod, and was recently seen by her farrier, again before I came along. His hooves are a very large and slightly oval shaped, but short enough. The owner reckons it's cos he isn't used to being ridden. He's kept out 24/7 with other horses. Is there anything I can do to curtail it? I feel unsettled when it happens?