09-11-2011, 08:40 PM
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Sprains (and swelling) are usually the worst on the 2nd day and then gradually start to get better. Ligaments are slow to heal, and I wouldn't call the vet unless it's not getting better after 4-5 days (unless he stops eating/drinking/etc, of course). Keep cold hosing/icing for the first 48 hours and try to limit movement to a paddock. I would stop the bute after a few days or you'll have a harder time seeing how it's progressing (in general, we don't use bute unless they are hobbling lame). Finally, don't bring him back to fast as it's common to re-injure if they're not fully healed.
Good luck to your boy...sprained fetlocks have always been one of the most painful things for us to watch.