For the past couple of weeks, we've been hanging out with this horse that another couple owns. We've only seen her three times, but all three times, there was a very noticeable behavior. This QH mare spends a LOT of time doing some sort of weird mouth thing. I'm sure a lot of you guys have seen it before. Sometimes it looks like yawning, but other times, she's just stretching her lips out and practically sticking her tongue out. This is just one of those quirks, right? Nothing important?
Keep in mind, I'm VERY much a beginner. I've seen it happen before, but don't really know why it happens or what it means.