I say fooey to all the above! Many of my horses have lived to be in their mid to late 30's. On top of that there are now many farriers who specialize in Natural Horse Trimming and are even certified in it. I have a pony who has foundered and has occasional flare-ups with separation and my farrier trims him out of it each time. It can take up to 9 months and if the pain is bad you may have to keep him on bute for a while but even in extreme cases natural trimming can work wonders.