Tense or Strained Nostrils / Muzzle
Look at the signal, then look at the whole horse and the situation around it.
NOTICE
The nostrils or muzzle look tighter, more angular, or more strained than usual.
You may notice:
- firmer or sharper-looking nostril edges
- a muzzle that has lost some of its usual softness
- a flatter or more drawn look around the nose
WHAT IT MAY TELL YOU
This kind of facial tension can appear with physical discomfort, pain, stress, or increased tension.
DON'T ASSUME
A tense muzzle does not automatically mean pain, fear, or one specific emotional state.
LOOK AGAIN
Look at the rest of the face and body. Check the eyes, mouth, chin, chewing muscles, ears, and posture.
Is the nostril simply wider, or does the surrounding muzzle also look tight and strained? Is the change brief, or does it continue?
Research / Learn More
What research suggests
The Horse Grimace Scale includes strained nostrils and flattening of the facial profile among several features associated with pain. Other equine pain studies also describe changes in nostril shape and muzzle tension.
What that does not mean
This feature is not a diagnosis. It becomes more useful when read alongside other facial, movement, and behavioral changes.
Sources
- Development of the Horse Grimace Scale — includes strained nostrils and flattening of the profile as one component of a multi-feature pain assessment.
- EquiFACS for pain-related facial responses — discusses nostril dilation and related facial changes observed during pain.