Gonadectomy

Castration in small animal patients is commonly performed as a routine procedure for population management and behavioral modification, but it may also be indicated for the prevention or treatment of specific medical conditions. Unneutered animals that reproduce without regulation contribute significantly to companion animal overpopulation. This overpopulation represents a serious concern in many communities, as evidenced by overcrowded animal shelters and rescue facilities.

Medical indications for castration as a therapeutic or disease-control measure include patients affected by:

• cryptorchidism (retention of one or both testicles within the abdomen)
• testicular hypoplasia or atrophy
• orchitis or epididymitis (testicular or epididymal infection)
• severe trauma to the testicles
• neoplasia of the testicles or epididymis
• testicular torsion
• perineal hernia
• concurrent urinary tract disorders, such as urethral calculi
• prostatic disease
• perianal adenomas

The impact of neutering on the future risk of certain cancers and orthopedic disorders remains a subject of debate. Scientific evidence regarding the optimal age for routine castration is limited. Therefore, the advantages, disadvantages, and appropriate timing of the procedure should be thoroughly discussed with a veterinarian.

Animals presented for routine elective castration for population control or behavioral purposes typically do not exhibit clinical signs. In contrast, pets suffering from diseases involving the testicles and/or epididymis may show signs related to the specific underlying condition.

Patients with cryptorchidism may present with an abdominal mass detected on physical examination and may exhibit clinical signs such as:

• nausea
• pain
• reduced appetite
• weight loss
• vomiting
• diarrhea
• alopecia
• enlargement of the mammary glands
• suppression of bone marrow function
• attraction of other male dogs

Clinical signs of testicular hypoplasia or atrophy are usually absent unless hormonally active cells remain functional, potentially leading to:

• hair loss
• mammary gland enlargement
• attraction of male dogs

Infections of the testicle or epididymis (orchitis/epididymitis) typically present with:

• testicular pain
• swelling of the scrotum
• depression
• lethargy
• fever
• decreased appetite

Testicular trauma may result in:

• scrotal swelling and discoloration
• pain
• hemorrhage
• systemic signs consistent with shock

Tumors affecting the testicles or epididymis commonly cause:

• enlargement of one or both testicles
• pain
• hair loss
• mammary gland enlargement
• attraction of male dogs

Patients experiencing testicular torsion usually exhibit:

• sudden onset of severe pain
• testicular enlargement
• depression

Clinical signs associated with perineal hernias include:

• swelling adjacent to the rectal area
• constipation
• straining during defecation
• difficulty or straining during urination

Signs related to urethral calculi include:

• straining to urinate
• partial or complete inability to urinate
• abnormal urine coloration
• abdominal discomfort
• lethargy
• depression
• loss of appetite

Prostatic disorders often result in prostatic enlargement, leading to:

• constipation
• difficulty defecating
• abdominal pain
• difficulty urinating
• discolored urine

Patients with perianal adenomas may demonstrate:

• one or more masses surrounding the rectal tissue
• bloody feces
• irritation of the perianal region

Once a testicular or epididymal disease is suspected, the primary veterinarian may recommend a comprehensive metabolic evaluation. This typically includes a complete blood count, biochemical analysis, and urinalysis to assess for concurrent disease and evaluate potential effects on bone marrow function. Thoracic and abdominal radiographs are indicated when neoplasia is suspected. Ultrasonography is valuable in identifying the underlying disease and assessing involvement of surrounding abdominal structures.

All patients with suspected testicular or epididymal infections should undergo urine culture and culture of affected tissues, along with blood testing for Brucella canis, a significant zoonotic pathogen affecting both dogs and humans. Tissues from patients with testicular or epididymal disease should be submitted for histopathologic examination to confirm the diagnosis and guide further treatment.

Young, healthy animals undergoing routine elective castration typically require only basic preoperative blood screening.

Two primary surgical techniques are commonly used for castration: the open technique and the closed technique. The choice between these approaches is based on the preference and experience of the veterinarian or veterinary surgeon. Scrotal ablation (removal of the scrotum) may be considered during consultation. Indications for scrotal ablation include the presence of an excessively large or pendulous scrotum or the need to address the underlying disease, such as trauma, urethral calculi, or neoplastic conditions.

Management of conditions such as perineal hernia, prostatic disease, or perianal adenomas may necessitate additional surgical procedures performed concurrently, depending on the surgeon’s assessment.

Postoperative care typically includes restricted activity with controlled leash walks for approximately two weeks. Cold compresses and oral pain medications, including non-steroidal anti-inflammatory drugs, may be prescribed depending on the patient’s condition. Surgical sutures are generally removed 10 to 14 days following surgery. Some patients may attempt to interfere with the incision site, making the use of an Elizabethan collar necessary.

The prognosis for routine elective castration is excellent. Prognosis for patients undergoing castration for disease-related reasons depends on the specific underlying condition. Decisions regarding the appropriate timing of castration should be made in consultation with a veterinarian.