Bispectral monitoring in dogs subjected to ovariohysterectomy and anesthetized with halothane, isoflurane or sevoflurane.

Objective: To assess the effect of halothane (H), isoflurane (I) or sevoflurane (S) on the bispectral index (BIS), and the effect of the addition of meperidine in dogs subjected to ovariohysterectomy.

Study Design: Prospective, randomized, blinded, clinical trial.

Animals: Forty-eight female mixed-breed dogs, with weights varying from 10 to 25 kg.