Hypothermia is a common anesthetic complication in small animals. Several studies indicate that cats going through surgery show a prevalence of 96.7% of this condition. In this regard, perioperative hypothermia is associated with many complications such as, increased intra-operative blood loss, presentation of post-surgical tachycardia, longer anesthetic recovery, along with others. A retrospective and prospective study were made in order to assess and compare two methods of external heating to reduce feline intraoperative hypothermia. The retrospective study was carried out on 16 cats undergoing anesthesia for a year and the research analysis was performed on a total of 35 cats for also a year. The heating methods that were investigated included the thermal blanket and bag. A statistical study was performed using Stata® V.14 showing a prevalence of hypothermia of the 96.07%. It was observed that the final temperature decreased on averageM1°C in orthopedic surgeries compared with soft tissue surgeries. Furthermore, the average temperature in felines without heating method was 31.6 ± 1.4°C, after an hour of surgery. For the same period, the temperature using the thermal bag method was 35.2 ± 0.5°C and for the blanket method was 35.4 ± 0.6°C. Consequently, the thermal blanket proved to be a more effective procedure in attenuating hypothermia as the surgery progresses