Design Goals: To design a large animal anesthesia machine with integral ventilator that will provide the veterinary profession with a superior device able to deliver ventilatory support for large animals while administering inhalant anesthetics, or without as in the ICU setting. To design a device that has features desired by large animal practitioners across the board, equine, marine mammal and zoo veterinarians. Tafonius will be supplied in two models. One being a turnkey unit for clinical every day use. The other will be a flexible, fully programmable version, usable as a research platform for the development of new more effective modes of ventilation in these larger species. The research machine will have the ability to generate any inspiratory and expiratory waveform desired. Both versions are to be smaller, more stable, easier to clean and in every respect more economical to run than any machine currently on the market. Tafonius will consume less oxygen, less anesthetic and generate less pollution. The anesthesia machine portion of Tafonius will be fully operable manually in the event of catastrophic computer failures. Approach: Solicitation of diverse expert opinions will be a high priority to insure the product satisfies the needs of a variety of markets. Implementation of Tafonius will be in phases. Once the basic system and physical plant has been proven feasible and problem free extra features and greater complexity will be added. Each existing machine will be upgradeable with new software. Deviation from the prior Art: