The burden of cumulative stress in current pig husbandry may reduce the future capacity of pigs to recover from challenges, i.e. their resilience. In the current study, the resilience of pigs was measured by following the recovery rate after a lipopolysaccharide (LPS) injection, which induces a sickness response. Sickness indicators are commonly obtained by highly invasive procedures. Acute inflammation is characterized by an instant vasoconstriction of blood vessels, which leads to a decrease in temperature of the extremities of the body, such as the tips of the ears. The objective was to use this metabolic process to measure the recovery rate of pigs with a non-invasive indicator, infrared imaging. At 15 weeks of age, 32 pigs were injected with 2 μg of LPS/kg of body weight while 16 other pigs received a saline solution. At 24 h before the LPS injection (baseline) and 1, 3, 5 and 24 h post injection blood samples were collected for cortisol concentrations. For each time point, rectal temperature was measured just before. Thermal images were taken with the FLIR T430sc camera at 24 h before (baseline) and at 1, 2, 3, 4, 5 and 6 h post injection. Ear temperatures (average temperature of the ¼ of the tip of the ear) were measured with the graphical software FLIR Tools. Pigs injected with LPS had lower ear temperatures at 1, 2, 3 and 4 h post injection compared to pigs injected with saline. At 6 h, the ear temperature was back to baseline. At climax of the sickness process, the temperature difference between the two groups reached 7.3 °C. Ear temperature at 1 h was highly correlated with the concentration of cortisol (r=-0.88) and with rectal temperature (r=-0.74). Thermal imaging appears to be a promising non invasive indicator of sickness recovery. The methodology is highly replicable and correlates with physiological indicators.