The ability for horses to perform visual discriminations is thought to be influenced by the height at which the stimulus is presented. The objective of this study was to determine if horses could visually discriminate based on the height the stimulus was presented. The test involved a two-choice, black/white discrimination with stimuli presented at two heights: ground level or at a height of 70 cm above the ground. The results indicated that the horses could visually discriminate better when the stimulus was at ground level. This information is important when training horses to accomplish tasks that involve visual discrimination. Also, it emphasizes the importance of the effect that the ground surface can have on a horse’s performance, which is important in both management and training.