Final answer:
The common name for the first upper premolar tooth in a horse is "Wolf," which are vestigial premolars and may sometimes be removed.
Step-by-step explanation:
The common name of the first upper premolar tooth in the horse is Wolf. This term specifically refers to the first premolar teeth of horses, which typically are small, underdeveloped, and may not have a function in the modern horse's mouth. They are often mistaken for canines, but they are, in fact, vestigial premolars that are sometimes removed to prevent complications. Horses typically have a dental formula that includes incisors at the front for slicing food, canines that are less frequently found and often only in males, premolars, and molars for grinding food. The first upper premolar - the wolf tooth - when present, is located just in front of the usual row of premolars and molars.