07-12-2010, 01:48 PM
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Has it been really wet where he is? Some horses may go through periods when the weather is really rainy where their joins (such as near the pastern area) become swollen, either from the moisture or from lack of movement on the mucky/slippery ground.
You should check for any heat or the beginnings of possibly some small red scabs as some horses (especially horses with white legs, i've found) are very suseptible to "scratches" in damp weather. I have a black arab mare & she'll get it in really wet weather, but only on her hind left leg, which is the only one with any white.
Of course, there are many other things that could be causing this & you could try simply hosing his legs off with cold water regularly. This swelling can be common in young horses & the only way to really know if it's something serious is to get him checked by a vet.