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A 2.5-month-old female Angus calf was evaluated for an acute onset of hind limb paresis. The calf had been unable to rise for several hours and on initial evaluation was alert and responsive but sluggish. The calf was able to rise on its forelimbs and did attempt to suckle. The calf's rectal temperature was 39.2°C (102.5°F; reference range, 36.7° to 39.1°C [98.1° to 102.4°F]), heart rate was 120 beats/min (reference range, 60 to 80 beats/min), and respiratory rate was 24 breaths/min (reference range, 30 to 50 breaths/min). No rumen contractions were detected; however, increased respiratory effort and bruxism were