Our hospital utilizes pulse-oximetry on our patients and continuous end-tidal CO2 monitoring is available to monitor patients under anesthesia, on long-term mechanical ventilation, and also as a monitor during CPR. These tools, along with blood gas analysis, can provide a quantitative assessment of how well a pet is able to breathe. For more critical patients, these values help our doctors to determine whether or not supplemental oxygen is needed. It also helps assess how effective treatments are in delivering oxygen to a patient's tissues.