Hi Lottie
Boots are useful during transition to barefoot and when the horse's feet have gone soft through being kept in too damp conditions.
If you havent't seen them already you may find the following websites useful.
www.barefoothorses.co.uk[url]www.successful-natural-horsecare.com/horse-nutrition.html[/url]I no longer need boots, and I do many miles over roads, stones etc but it took a bit of research and reeducation to get there.
The biggest problem for me was diet. You may or may not be familiar with the concepts of a 'stretched' white line and flare. At the risk of causing offence to our shod friends - a hell of a lot of shod horses have 'flare' so human eyes start to see it as normal and I have known farriers actually encourage it because they think it is beneficial to the horse to have a bigger foot.
I tried and tried to get rid of my horse's flare and stretched white lines and finally succeeded when I eliminated all simple starch/sugar from my girl's diet.
You have to become something of a sleuth because most vets are not experienced enough in this field to help. My girl has very little body fat at all and has a forage based diet, so technically not at high risk from laminitus, sub clinical or chronic. But I found that at odd intervals she would go footy over rough/stony ground and would get a slight swelling on the inside of her leg below the knee in the groove between her cannon bone and tendons.
My vet told me after many fruitless examinations including x ray and MRI that it was a minor recurring sprain and I shouldn't worry about it. So I kept a diary and eventually found that the vein came up when she had been out at grass or had a feed with even a tiny amount of molasses in it. Nothing to do with exercise at all.
Environment is important too. Grazing in this country is generally too high in sugar and low in magnesium and in the winter is too wet under foot. Read 'Paddock Paradise' by Jamie Jackson, or review the examples on the above sites.
I find the grazing issue very tough because I keep my horse at livery where most of the horses are on very lush pasture, are very fat, mostly lame and never take any exercise. So I get lots of negative attitude about my lean, barefoot, running machine.
I have found that exercise is good - as much as your horse can manage - with boots if you need. This stimulates the foot to grow incredibly fast so you can get a good foot that much sooner.
Good luck and if you want any more 'war stories' about how to go barefoot give me a shout - I will be happy to share my successes and disasters and other good websites with you.