Horse (stallion)
Equus caballus
50 cm
Total length of the non-erect ('quiescent') penis including the root (ischial arch to glans); of this, about 15–20 cm is the free part inside the prepuce
A stallion's penis is about 50 cm long when not erect, counting the root. Erection adds at least half as much again, and the glans swells more than the rest.
Margin note: The horse would like it noted that this is the relaxed figure.
Sources
- Sisson S. (1914) The Anatomy of the Domestic Animals. 2nd ed., entirely reset. Philadelphia & London: W. B. Saunders Company. Genital organs of the stallion: The penis, pp. 580–582; Fig. 518 link
- Equine Section, Department of Animal Sciences, University of Kentucky (1988) The Stallion: Breeding Soundness Examination & Reproductive Anatomy. Cooperative Extension Service publication ASC-117 link
- Ünal N., Paksoy Y., Güngör Ö.F. (2025) Agreement of the morphometric dimensions determined by traditional and image analysis methods for Arabian and Thoroughbred horses. Arch. Anim. Breed. 68:253–261 doi:10.5194/aab-68-253-2025
Drawn from
- Sisson 1914, Fig. 518 (p. 580): Penis of horse; lateral view: Whole non-erect organ from root (tuber ischii) to glans: laterally flattened body, collum and corona glandis, urethral process
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