I went to look at a 3 year old POA filly today and I really like her but I'm curious about a habit she has. She sticks her tongue out sideways and chews on it. Her owner says she's done it ever since they got her as a weanling. She lives in a smallish pen with no other horses and she obviously is extremely bored. I walked her through the neighborhood a little bit and she was well behaved for the most part but understandably high strung. When I had her standing still while talking to her owner, the filly chewed her tongue and pawed.
Is this a result of boredom, pent up energy, or something else? Do you think I could make her stop?