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Development of the Horse Grimace Scale (HGS) as a Pain Assessment Tool in Horses Undergoing Routine Castration

Figure 2

Horse Grimace Pain Scale (HGS).

The Horse Grimace Pain Scale with images and explanations for each of the 6 facial action units (FAUs). Each FAU is scored according to whether it is not present (score of 0), moderately present (score of 1) and obliviously present (score of 2).

Figure 2

doi: https://doi.org/10.1371/journal.pone.0092281.g002