A 6-year-old Quarter Horse Wood constitution mare was presented for TCVM evaluation for poor performance and unprovoked outbursts of anger for the past 3-4 months. On examination her Shen was very good, pulses were strong and her tongue was purplish, slightly red at the sides and without coating. Her eyes were slightly red. Increased sensitivities were noted bilaterally on digital palpation of GB-20 (3-4+/5), BL-18 and 19 (3+/5) and BL-54 and Lu-gu (4+/5). The Traditional Chinese Veterinary Medicine pattern identified was Liver Qi Stagnation with Liver Yang Rising and local Qi stagnation of both hips. The horse was treated with dry needle acupuncture, electro-acupuncture and 2 Chinese herbal formulas, Liver Happy (modified Chai Hu Shu Gan Wan) and Body Sore (modified Shen Tong Zhu Yu Tang). After 2 acupuncture treatments 1 week apart and 2 weeks of herbal treatment, the client reported that the mare had had no anger episodes and was performing well. On re-examination, the horse’s tongue and pulses were normal and no sensitivities were noted when palpating diagnostic acupoints. The client was instructed to continue Liver Happy and Body Sore for another 2 months then discontinue. She was also advised to have acupuncture and resume Liver Happy the next Spring to avoid the recurrence of Liver Qi Stagnation as Wood animals tend to have exacerbation of their Stagnation problems in the spring and the summer Heat can worsen their Liver Yang Rising.