The BBC has posted an RSPCA story from the UK which stimulated some discussion today. A pony stallion was found in Wales with neglected hooves, one of which was over a meter long. I wondered simultaneously at the cruelty of the owner to ignore the poor horse, but also wondered if there is a Guiness Book of World Records for the longest pony hooves? Amazingly, it doesn't sound as if the horse had laminitis. He grew quite a mane too, but doesn't look hungry.
If you take a good look at the photo, it is obviously the right front that grew to the great length that it did a spiral; the left front is growing in with much wider radius...and straight up in the air. After listening to or reading Meike Van Heel's research on asymmetric stance and foal development, this difference jumps right out at you.
Read all about this pony's rescue by the RSPCA (but not much about the hooves) at http://news.bbc.co.uk/2/hi/uk_news/wales/south_west/6177606.stm
