So true. Laminitis is an inflammatory response in the hoof and can occur for a number of reasons. The most common is often over feeding but can be a number of things. White line separation is a good indication too of problems. Here is a decent article on laminitis http://www.all-natural-horse-care.com/laminitis-in-horses.html. It has some good explanations and drawings of hooves. That poor pony in the pic just looks miserable. I found a tragic picture of a cart horse somewhere that was foundering and in full harness and hitched. I had tears in my eyes for that poor animal to be forced to pull when it was clearly in so much pain. The hoof is a vital part of circulation and support for the entire body of the horse. Most people treat the hoof as a separate entity on a horse but I feel like a horse's foot is like the canary in the coal mine, when the foot gets bad the whole body is being damaged in my opinion. No hoof, no horse!
Founder isn't just caused by food, but that is a common cause. Founder is also caused by infection or illness. Years ago, we had a mare that foaled and then got a VERY serious uterine infection afterwards. We had her cleaned out, but alas, things just happen anyway. She got such a high fever for so long and was so ill (despite penicillin injections), she ended up foundering. Her laminitis was pretty severe, and her coffin bone did rotate and start to push thru the sole of her hoof. We wound up in rubber wedges and rubber boots for nearly two years correcting her condition. Feet issues can and will cost you an arm and a leg. My farrier has a moto--- "No feet, no horse" and it's true. You either spend a fortune fixing them (which is always what we end up doing) or you put them down. Now, we've had a lot of horses over the years, and I'd say out of every 7 horses we would get, we'd end up with a foot problem-- not necessarily at the time of purchase, but like I said.... things just happen! LOL Honestly, x-rays are CHEAP compared to buying a horse with problems. We now have any horse we are looking at inspected by our farrier and the last time, we had a vet check them too. You can spend $60 on an x-ray or you can spend thousands later on for being duped. Now... what happens after you bring home healthy feet... you can't often predict.