Thermography can be used to determine if there is inflammation in an area that was sore on palpation, or to detect an area of increased blood flow when there is no specific pain or signs (subclinical inflammation). Most horses don't  have just one problem associated with a lameness. Thermography also helps in detecting the secondary areas with problems. It has been researched that tendons will show inflammatory changes up to two to three weeks before clinical lameness is apparent. I have recorded hoof inflammation in a horse 3 months prior to clinical signs and a veterinary diagnosis of laminitis