Why do horses raise their upper lips in a "horse laugh"?
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Horses will curl up their lip, which will press up against the back of their nose this is called Flehmen.
A horse does this to detect an odor. This is seen more in males than females.
A stallion will make this face when he examines a mares urine to find out if she is in heat.
Flehmen is when horses raise their upper lip and tilt their head back in order to trap and analyze pheromone scents. Stallions typically do this when they are around a mare in estrus. However, all horses may do this when exposed to a strong, unusual smell, such as smoke or fresh paint.
A horse may 'smile' when smelling a strong odor. The horse curls its lips upwards to close the naval cavities so they can hold the sent and analyze it more closley. This helps horses trap pheromone scents from other horses. Some horses, such as my horse will smile on command for a mint and will also smile to show that he likes where you are scratching him!
Horses will curl their upper lip to lock in their nostrils a spicific sent. That is call Flehmen. Also stallions will do this to see if a mare is in heat.
Horses will raise their upper lips that they are realasked or they are doing it for fun.
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