Depending on the breed of horse, the penis could be between 12 to about 24 Flare is the term for the ridge at. That would be during a time of a full erection, obviously
Some stallions may even have a penis about 36 inches long. It is best to take the horse to a licensed veterinarian to diagnose the issue What is the maximum length of a horse penis
Big stallions are probably about 32 inches. The stallion's penis flares during mating to ensure that semen stays inside the mare's vagina and therefore increase the chance of siring a foal If a horse has a penis that is flared or swollen, it may be infected
