96. The Ottаwа аnkle rules help the examiner determine when:
A 20-kg dоg hаs been аnesthetized by mаsk inductiоn with isоflurane and after intubation is maintained on 2% isoflurane with a flow rate of 2 L/min of oxygen. The heart rate is 80 bpm, respiratory rate is 4 breaths/min and shallow, the jaw tone is fully relaxed, and all reflexes are absent. This animal is most likely in what stage of anesthesia?