Surgical procedures include intrinsic complications, both medical and anesthetic, so the anesthetic monitoring is vital to maintain the patient integrity. One parameter to watch is the body temperature. Between May and June 2015, it was made a comparative study of three methods thermometric in canine patients undergoing to various surgical procedures in the Clinical Veterinary Teaching Hospital (HCVD) of the Santo Tomas University (UST), Talca, Chile. The correlation of different thermometric methods showed that there was a positive partnership between them, however, when they were individually correlated, different results were obtained: the correlation between esophageal and rectal method (RE) was low, also the correlation value between the esophageal and axillary method (EA) was low. The correlation between the rectal and axillary (RA) methods was high. When comparing individual values thermometric methods, no significant differences between them were evidenced (P ≥ 0.05). In the comparative proof between central and peripherals methods no significant differences were evidenced (P ≥ 0.05). In the benchmark, it was determined that there is no significant difference between the thermometric measurements of rectal thermistor probe, esophageal and axillary digital thermometer. With this, it is concluded that the temperature values of the different methods used individually have different but similar magnitudes, which means that there would be no difference in using any of these methods for anesthetic monitoring