Final answer:
PLI is measured in both small and large animals to assess their gait, weight distribution, and foot problems.
Step-by-step explanation:
PLI stands for Plantar Load Index, which is a measure of the pressure exerted on a surface by the paws or feet of animals. PLI is typically measured in both small and large animals, such as mice, rats, dogs, and horses, as it provides valuable information about their gait, weight distribution, and potential foot problems.