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We used eye-surface temperature and heart rate as simple, noninvasive physiological indices to evaluate dogs' responses to an approaching person. Thirteen healthy pet dogs (49.62 ± 31.42 months; 19.28 ± 11.46 kg) were recruited as subjects to investigate physiological responses to approach. We set up two types of approach (smiling and expressionless) by familiar or unfamiliar people of either sex, and all tests were recorded by video cameras. Eye temperature was measured with an infrareddoi:10.4236/ojas.2016.62018 fatcat:7i4tarkmn5hy5aovsyxlufvfgy