Mechanical separation
Commonly known as road founder, mechanical separation occurs when horses with long toes are worked extensively on hard ground. The long toes and hard ground together contribute to delayed breakover, hence mechanical separation of the laminae at the toe. Historically, this was seen in carriage horses bred for heavy bodies and long, slim legs with relatively small hooves; their hooves were trimmed for long toes (to make them lift their feet higher, enhancing their stylish "action"), and they were worked at speed on hard roads. Road founder is also seen in overweight animals, particularly when hooves are allowed to grow long; classic examples are ponies on pasture board in spring, and pregnant mares. Poor blood circulation
Normal blood circulation in the lower limbs of a horse depends in part on the horse moving about. Lack of sufficient movement, alone or in combination with other factors, can cause stagnant anoxia, which in turn can cause laminitis.A horse favoring an injured leg will both severely limit its movement and place greater weight on the other legs. This sometimes leads to static laminitis, particularly if the animal is confined in a stall. A notable example is the 2006 Kentucky Derby winner Barbaro.Transport laminitis sometimes occurs in horses confined in a trailer or other  transportation for long periods of time. Historically, the most extreme instances were of horses shipped overseas on sailing ships.
Famous brothers
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