Foaming at the Mouth

Q: My friend's 3-year-old filly plays with her tongue so much that she foams at the mouth (without a bit). She also plays with the rails in her stalls at feeding time such that she has foam all over. She is not cribbing or sucking air. What could be the problem?    via e-mail

A: Between the ages of 2 1/2 and

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