Perhaps you could try hoof boots instead of shoes. I Trail ride and have been using Renegade Hoof Boots for a few years now. I also have freinds who do shows and use boots on their horses too. My horse is an 11 yr old QH and has never had shoes on. A freind of mine pulled her shoes because her horse was haveing truoble and is now using hoof boots. They are great because you don't have to leave them on all the time and offer the protection that you might want for your horses feet. There's many different types of hoof boots. I think it's somewhat a matter of personal prefference.
I second this! Hoof boots are a great idea for sure.