What is the term used to describe small eyes placed close together on the horse's head?

The term that accurately describes small eyes placed close together on a horse's head is "Pig eye." This term is commonly used in equine evaluations to denote a specific conformation trait that can affect the horse's overall appearance and functionality. Horses with pig eyes may exhibit limited vision, which can be considered a negative trait in certain contexts, especially in performance horses that require good eyesight for optimal navigation and reaction.

The other terms do not specifically refer to the trait of small, close-set eyes. "Baby eye" is not a standardized term in equine conformation and does not accurately describe any specific variation in eye placement. "Close-set eye" could describe the positioning but does not carry the same connotation or widely recognized terminology as "pig eye." "Petite eye" might be used to refer to the size but does not capture the specific placement aspect as effectively as "pig eye." Therefore, "Pig eye" is the most appropriate terminology in this context.