NAVLE Reproductive

Canine Penile Disorders Study Guide

March 28, 2026 25 min read 21 views
Penile disorders in dogs represent a significant category of reproductive pathology affecting breeding soundness, urinary function, and quality of life.

Overview and Clinical Importance

Penile disorders in dogs represent a significant category of reproductive pathology affecting breeding soundness, urinary function, and quality of life. This guide covers the four major disorders commonly tested on the NAVLE: balanoposthitis, paraphimosis, priapism, and phimosis. These conditions range from benign (mild balanoposthitis) to true emergencies (paraphimosis with necrosis, ischemic priapism).

Structure Clinical Significance
Corpus Cavernosum Paired erectile tissue; main body of erection. Site of blood pooling in priapism.
Os Penis Ossified distal corpus cavernosum. Urethra runs in ventral groove. Common site for urethral obstruction with calculi.
Bulbus Glandis Proximal glans; greatest expansion during erection. Responsible for the "tie" during mating.
Prepuce Tubular sheath covering non-erect glans. External (haired) and internal (mucosal) laminae.
Preputial Orifice External opening. Stenosis causes phimosis. Size relative to erect penis determines paraphimosis risk.

Functional Anatomy of the Canine Penis and Prepuce

The canine penis is divided into three regions: the root (attached to ischial arch), the body, and the glans penis (distal portion).

High-YieldThe os penis is unique to carnivores. The urethra runs in a ventral groove, making it a common site for urethral obstruction with calculi. Remember: "Os penis = urethral obstruction risk."
Category Specific Causes
Bacterial E. coli, Proteus, Staphylococcus, Streptococcus, Pseudomonas, Mycoplasma canis
Viral Canine herpesvirus (CHV-1), Canine calicivirus (rare)
Neoplastic Transmissible venereal tumor (TVT), squamous cell carcinoma, papilloma
Mechanical Foreign bodies (grass awns, hair), trauma, phimosis

Balanoposthitis

Definition and Pathophysiology

Balanoposthitis is inflammation of the penile mucosa (balanitis) and preputial mucosa (posthitis). It is the most common penile disorder in dogs, occurring primarily in intact males. A slight mucoid discharge is NORMAL in sexually mature dogs.

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