My horse is incredibly sweet and well behaved, but she occasionally lifts her lip and bares her teeth and I don't understand the meaning of the gesture. I know horses bite each other in play, but don't know if I should interpret it that way or as a threat. Any information would be greatly appreciated.
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Lifting her lip if there is no indication of aggression is probably due to "Flehmaes response" - the usual reasons for this are catching a scent, inhaling it deeply and allowing it to permeate the vomeronasal organ situated in the roof of the mouth - this is why horses and dogs can smell so much better than we can! (we dont have that organ. Now, there is one other occasion I have seen my friends horse uses it...she learnt that it makes us laugh and gets her attention (yes really!). If we are standing talking to each other and she gets bored waiting she will often pull this Flehmen face and try as I might I can't help laughing at her :-) So, as long as the rest of her body language is calm you need not fear that it is an aggressive gesture at all.
Flehmens ...sorry for the typo
Hmm, just been checking this in more detail to make sure I had got it right and saw a comment that occasionally it can be done by horses who are experiencing some abdominal discomfort...may be worth exploring that too - this is new to me, I didn't know there was any link to that and it may be an anecdotal comment with no evidenc to back it up so would be interested in your findings :-)