horse eating mud?

Eating mud is perfectly normal for horses. It's a way of getting minerals in their raw form. Henry sometimes does it (but only at certain places). He's done it when on more than one supplement, too. As long as he isn't shovelling huge clods of earth down his gullet I shouldn't worry too much.
 
All horses self-medicate if they have the need - and the resources to do it with. We have willow tress in our field, and horses we've owned with arthritis doctor thejselves regularly on the leaves. Wouldn't worry too much.
 
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