To better understand how horses’ body temperatures increase during exercise, researchers used a smart thermometer horses swallow as a pill. They confirmed that horses cool down at different rates, suggesting generalized protocols for avoiding heat stroke might not be ideal for all horses.
Source: The Horse, April 19, 2023. Link.
The gastrointestinal pill has been a reliable method to monitor body temperature in exercising horses and, moreover, to identify horses with increased body temperatures.”