Stumbling

Question
Hi after not owning a horse for 7 years I recently bought a four year old traditional irish cob. He is wonderfull in every way EXCEPT he is always stumbling / tripping. I have had him checked out by a vet and a farrier and they can see noting wrong with him.

I would really appreciate your advice

thanks
Emma
I think it is a concentration issue. Yesterday we were walking into a field and suddenly i was gazing at the clouds - he was on his knees - I had fallen off the side. It not the first time. When I am working him hard he doesnt stumble at all. He is so good in every other respect.
I like trail ridding - I want to go on treks and relax and be able to trust him without constantly keeping my leg on. He doesnt spook and is very trusting in everyway.

ps I am from ireland, ride english style or bareback and vary where I ride every other day - sand arena, roadwork, fields.
Mr G has just gone four  (april) but was wild in Nov 07. He began training in January 08. He doesnt have balancing issues - eg trots and canters correctly and when asked, excepts the bit and has NO other vices, but this is really getting me down.  

Answer
Some time a horse is never taught how to use their feet well.  If a horse is put in a stall a lot they will get more clumsy.  Work him in a round pen at different speeds, walk, trot and canter and have him change direction a lot.  That will teach him to use his feet and balance better.  Some time a rider will cause a lot of trips, a horse depends on the rider to stay balanced and out of his way, if the rider is not paying attention or gets off balance then that can cause a horse to trip.

When riding, do lots of hills, creeks, uneven ground work, all of that will help him improve his balance and get better when you are on him.

Rick