Although electrocution is widely reported in the human literature, there are no welldocumented cases reported in horses. A probable diagnosis of electric shock injury was made in the case of an 18 year old Quarter Horse breeding stallion that presented to the Cornell University Hospital for Animals with a chief complaint of seizure-like activity following loss of electrical power at the farm. Pertinent physical exam findings included hyperhidrosis, diffuse muscle fasciculations and contractions, and severe ataxia involving all four limbs. A complete blood count revealed a marked leukocytosis, characterized by a neutrophilia and eosinophilia. The neurologic signs resolved within 18 hours of presentation with minimal therapeutic intervention. Ventricular tachycardia without associated clinical signs developed 20 hours following presentation, and resolved without treatment. The rapid and complete recovery made an infectious process or structural lesion highly unlikely, leading to a presumptive diagnosis of electrocution.