So my bfs mustang was recently diagnosed with navicular disease. He's been out of the wild for about 2 years and he bought him from the original trainers to be an endurance horse in August. He doesn't have to best conformation and runs like a tank, I mean riding him I've never been on a horse that feels as hard on himself as he does. Just riding him beats you up. Anyway he had been working him about 40 miles a week up to November when he rode is first race, he vetted fine but after that he started getting extremely sour to the point he would stop on trails. In December on the lunge line he was slightly off on the right but fine in larger circles and didn't have any heat in the leg. We didn't work him all December and January, he seemed to be getting better until two days before our vet appointment when put him in a new field and he ran from us when we went to cat h him, he was the more lame than he had ever been but the be t morning when we he ran from us he seemed fine and the ver thought he was fine before X-rays. On the X-rays we found what the doc called as calcified cartilage on the right foot above the coronet band which could cause inflammation and erosion of the navicular bone. He didn't want to pick up the right foot for the left X-ray and had slight erosion on the left and was diagnosed navicular. After talking to the ppl he bought the horse from they think having too tight of shoes caused lack of blood flow and that loosening the shoes can reverse it because he is only 5. I have never had a navicular horse so I have no idea. I personally think its how hard he is on himself and not being built to run 40 miles a week with 200 lbs on his back. Doc thinks what I do and that it has probably been in the process most of his life, he has only had shoes on since the end of October and is on permanent turn out. What do you guys think/ have experience with?