Scrotal Hernias in Dogs: Recognizing the Red Flags Before Bowel Compromise Occurs

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Soft Tissue Surgery Ultrasound Diagnosis

Scrotal Hernias in Dogs: Recognizing the Red Flags Before Bowel Compromise Occurs

Scrotal hernias (SHs) are an uncommon but clinically important type of indirect inguinal hernia seen in male dogs. In these cases, abdominal organs pass through the vaginal process and descend into the scrotum. Unlike direct inguinal hernias, where organs protrude adjacent to the vaginal process, indirect SHs often involve smaller defects, increasing the likelihood of organ entrapment and dysfunction¹.

Although SHs are relatively rare, they should remain an important differential diagnosis whenever a male dog presents with unilateral scrotal swelling. Delayed recognition can result in intestinal strangulation, bowel necrosis, and the need for more extensive surgical procedures such as intestinal resection and anastomosis.

Clinical Signs Can Range from Mild to Life-Threatening

One of the most challenging aspects of SH is its highly variable presentation. Many dogs remain clinically stable and are referred after owners notice progressive scrotal enlargement. Others, however, may present through emergency services with gastrointestinal compromise.

A particularly important clinical observation is the association between vomiting and nonviable bowel. In dogs with intestinal entrapment, prolonged vomiting was strongly associated with intestinal strangulation requiring resection and anastomosis¹. In fact, all dogs in the series that required bowel resection presented with vomiting as a major complaint.

Clinicians should therefore pay close attention to the following warning signs:

Vomiting lasting several days

Acute enlargement of the scrotum

Abdominal discomfort

Signs of intestinal obstruction

Depression or shock

These findings may indicate compromised intestinal viability and the need for immediate surgical intervention.

Castration Does Not Eliminate the Risk¹

A common misconception is that SH occurs only in intact male dogs. However, more than 25% of dogs diagnosed with SH in the report had previously undergone castration. This makes reproductive status an unreliable factor for excluding the condition.

For clinicians, this is a particularly practical takeaway. Neutered dogs presenting with scrotal swelling may initially be suspected of having postoperative inflammation, fluid accumulation, or neoplasia. However, SH should remain part of the differential diagnosis even in previously castrated patients.

The Growing Role of Diagnostic Imaging¹

Although definitive diagnosis is often confirmed during surgery, ultrasonography has become an extremely valuable diagnostic tool for identifying herniated contents. Ultrasound findings of intestinal herniation consistently matched surgical findings in affected dogs, making imaging highly useful for determining urgency.

Radiographs may also help identify intestinal obstruction or abnormal gas patterns when gastrointestinal signs are present. Importantly, imaging findings combined with physical examination often help determine whether surgery can be scheduled electively or should proceed on an emergency basis.

Not all SH cases require immediate intervention, but dogs showing evidence of bowel compromise should never experience delays in surgical referral.

Surgical Repair and Intraoperative Considerations

Surgery remains the treatment of choice because it reduces the risk of ongoing organ entrapment and future strangulation. Multiple surgical approaches have been described, including ventral abdominal incisions extended caudally toward the inguinal ring and prescrotal approaches with separate herniorrhaphy incisions^1,2,3.

While techniques varied, one practical advantage of a caudal abdominal approach is improved visualization of herniated organs, particularly when intestinal viability is uncertain.

The most commonly herniated structures included:

Small intestine

Omentum

In severe cases, devitalized intestine required resection and anastomosis before hernia repair could be completed.

Concurrent castration was frequently performed in intact dogs, although successful herniorrhaphy was not dependent on neutering. Patient age, breed, and the potential orthopedic or neoplastic implications of early castration should still be considered carefully^1,4.

Prognosis Is Excellent with Timely Treatment¹

Despite the potential severity of SH, postoperative outcomes were highly favorable. All dogs undergoing surgery survived to discharge, and complications were generally mild, consisting mainly of incision-related inflammation or temporary anorexia.

Perhaps most encouragingly, recurrence of herniation was not reported regardless of the surgical technique used. These findings reinforce the importance of early diagnosis and timely intervention.

Final Clinical Perspective

Scrotal hernias may be uncommon, but they should never be dismissed as a minor scrotal abnormality. In dogs presenting with unilateral scrotal swelling, particularly when accompanied by vomiting or gastrointestinal signs, clinicians should maintain a strong suspicion for intestinal entrapment.

Prompt imaging, careful assessment of bowel viability, and timely surgical repair remain the key factors in preventing serious complications and achieving excellent long-term outcomes.

References

Austin EM, Cooper L, Grimes JA, Kawecki-Wright E, Chun I, Singh A, Crowley J, Marchevsky A, Gallaher HM, Dickerson VM. Scrotal hernias in dogs should not be ruled out based on castration status and may require enterectomy. Journal of the American Veterinary Medical Association. 2025 Sep 26;1(aop):1-6. https://avmajournals.avma.org/downloadpdf/view/journals/javma/264/2/javma.25.06.0363.pdf

Sousa GC, Denadai R, Fuchs KM, Pelaquim IF, Oba E, Souza FF. Acute scrotal enlargement in a 5-month-old puppy. Journal of the American Veterinary Medical Association. 2023 Jul 26;261(10):1-3. https://avmajournals.avma.org/view/journals/javma/261/10/javma.23.05.0286.xml?tab_body=pdf

Draheim P, Hlusko K, Cole R, Douglas J, Withers C, Graff E, Wilborn R. A case of unilateral hydrocele in a dog secondary to inapparent inguinal hernia. Clinical Theriogenology. 2022 Dec 1;14(4):362-5. https://polarresearch.net/index.php/CT/article/download/9172/15052