Thanks for all the input! I am going to gets some Carlos Tabernaberri and Clinton Anderson literature. Yes, all 5 horses we have are out all day and night on 8 acres to graze. They get wet down alfalfa cubes, 10% stock/stable, and wet down whole flax twice a day and now that it's daylight longer I put a bridle on her and walk her in the pasture. I will look into toys, we don't have any but it sounds like a good idea! Yesterday on the trail my riding partners horse spooked at a noise and Angel spooked, tripped, recovered and took off on a wild ride through the saw palmettos, the saddle slipped and I bit the dust. Not fun but no broken bones, we have some bombproofing to do, it happened once before, twice is too much.
As far as ulcers, it's hard to find a vet here who knows horses and even the ones that do have dubious reputations... what would be the treatment?