Abstract: The present invention relates to a device for assessing localized heat resulting from underlying injury in horses, or other mammals, through thermal imaging employing thermochromic liquid crystal displays and methods for their use. The device of the present invention comprises a wrap made of flexible fabric, and incorporates a sheet or sheets of thermochromic liquid crystal material as “windows”, held securely against possible injury sites. A method is claimed of detecting underlying injury in mammals by (a) applying a thermal imaging wrap to an area that is suspected of harboring an injury, (b) applying a second thermal imaging wrap in a parallel or bilateral region not suspected of harboring an injury, and comparing the results of (a) and (b). Besides horses, other mammals, such as dogs, donkeys, mules, llamas, camels, and humans may likewise be evaluated.