Anal Sac Removal in Dogs: Anal Gland Surgery, Benefits, Risks & Recovery

Key Takeaways

Anal sac removal is a definitive treatment for selected cases, not a routine solution for every dog with anal sac disease.

The most important clinical points are:

Anal sac disease includes impaction, inflammation, infection, abscessation, and neoplasia. Diagnosis should be based on physical and rectal examination, with additional diagnostics when indicated. Most uncomplicated cases can initially be managed medically. Recurrent disease that fails appropriate medical treatment may justify anal sacculectomy. Anal sac neoplasia requires diagnostic staging and a different treatment strategy. Fecal incontinence is one of the most important complications to discuss before surgery. Temporary bowel-control changes can occur during postoperative recovery. Anal sacs are not essential digestive organs. Patient selection, surgical technique, and careful protection of surrounding nerves and tissues are critical. Complicated or neoplastic cases may benefit from referral to a veterinary surgeon and/or veterinary oncologist.

Anal sac disease is common in dogs and can range from uncomplicated impaction to recurrent infection, abscessation, and neoplasia. Most cases do not require surgery. However, when appropriate medical management fails, disease repeatedly recurs, or an anal sac tumor is present, anal sacculectomy, or surgical removal of the anal sac, may be indicated.

For veterinarians and veterinary students, the key clinical question is not simply whether anal sac removal has benefits and risks. It is when the expected benefit of surgery outweighs the risks associated with operating in a region containing important nerves and the external anal sphincter.

What Are the Anal Sacs in Dogs?

The anal sacs are paired structures located on either side of the anus, approximately at the 4 and 8 o'clock positions. Each sac contains secretory tissue that produces a characteristic malodorous fluid. The secretion is normally released through a duct into the anal canal and can be expelled during defecation.

The terms anal sacs and anal glands are often used interchangeably in clinical and client-facing communication. Strictly speaking, the sacs are the pouches that contain the secretory glands.

The function of anal sac secretions is associated primarily with scent communication and marking rather than digestion. Removal of the anal sacs therefore does not remove an essential digestive organ.

What Causes Anal Sac Problems in Dogs?

The underlying cause is not always straightforward. Factors associated with anal sac disease include:

• Poor emptying of the sacs during defecation
• Thickened or abnormal sac contents
• Inflammation of the anal sac ducts
• Changes in stool consistency
• Obesity or reduced muscle tone
• Generalized skin disease or seborrhea
• Recurrent bacterial infection
• Structural abnormalities
• Neoplasia

Changes in stool consistency can also affect normal mechanical emptying. Both diarrhea and constipation may be relevant in dogs with recurrent anal sac problems, although the underlying cause should be assessed rather than assuming stool consistency is the sole explanation.

What Are the Clinical Signs of Anal Sac Disease?

The clinical presentation depends on the type and severity of disease.

Scooting is a familiar sign, but it is not specific to anal sac disease. A complete examination is necessary to differentiate anal sac disease from other causes of perianal irritation.

Anal sac tumors can be particularly subtle. Some dogs have relatively limited local signs despite significant disease, while others present with constipation, tenesmus, a palpable mass, or clinical signs associated with hypercalcemia.

How Is Anal Sac Disease Diagnosed?

A diagnosis should begin with a complete physical examination and digital rectal examination, when appropriate.

The veterinarian should assess both anal sacs for:

• Size
• Consistency
• Pain
• Ability to express contents
• Character of the material
• Presence of a mass
• Evidence of rupture or fistulous tracts
• Changes in surrounding tissues

Most uncomplicated cases can be diagnosed clinically. However, additional diagnostics may be warranted when the presentation is recurrent, atypical, severe, or suspicious for neoplasia.

Depending on the clinical findings, diagnostic workup may include:

• Cytology
• Microscopic examination of sac contents
• Bacterial culture when clinically indicated
• Fine-needle aspiration or biopsy of a mass
• Ultrasonography
• Bloodwork
• Serum calcium measurement
• Thoracic imaging
• Abdominal imaging for suspected metastatic disease

Merck Veterinary Manual notes that microscopy, ultrasonography, or biopsy may be required when routine examination does not provide enough information or when infection or neoplasia is suspected.

What Is Anal Sacculectomy?

Anal sacculectomy is the surgical excision of one or both anal sacs.

It is also commonly called:

• Anal sac removal
• Anal gland removal
• Anal gland surgery

The procedure is performed under general anesthesia. The surgeon carefully isolates the affected sac and removes it while attempting to preserve the surrounding tissues, nerves, and anal sphincter.

Because of the anatomy of the region, this is considered a delicate procedure rather than a routine superficial mass removal.

The closed surgical technique is generally preferred because it has been associated with a lower complication rate than some alternative approaches.

What Happens During Anal Sac Removal Surgery?

The exact approach depends on the patient's anatomy, disease severity, whether the procedure is unilateral or bilateral, and whether neoplasia is suspected.

A typical procedure involves:

Preoperative Assessment

The patient should undergo an appropriate physical examination and pre-anesthetic assessment.

Depending on age, health status, disease severity, and surgical indication, this may include:

• CBC
• Serum biochemistry
• Electrolytes
• Urinalysis
• Additional imaging
• Serum calcium assessment when a tumor is suspected
• Staging diagnostics for confirmed or strongly suspected neoplasia

General Anesthesia

Anal sacculectomy requires general anesthesia because precise dissection is necessary in a sensitive anatomical region.

Surgical Dissection

The surgeon identifies and carefully dissects the affected anal sac from the surrounding tissues.

Particular attention is required because nerves associated with anal sphincter function are located near the surgical field.

Sac Removal

The affected sac is removed and, when indicated, submitted for histopathologic evaluation.

Histopathology is particularly important when a mass, unusual thickening, persistent inflammation, or other abnormality raises concern for neoplasia.

Closure and Recovery

The surgical site is closed and the patient is monitored during anesthetic recovery.

Postoperative treatment may include analgesia, appropriate wound care, activity restriction, an Elizabethan collar, and stool-softening therapy when indicated.

Dog Anal Gland Removal Pros and Cons

Anal sacculectomy is a procedure with both benefits and some potential risks. 

Dog Gland Removal Pros and Cons Comparison Table

Let’s discuss these pros and cons one by one‌. 

Pros of Dog Gland Removal

There are several potential benefits associated with dog anal sacculectomy. The pros of dog gland removal are as follows.

•  Prevention of Anal Gland Infection Dog

One of the most significant advantages of dog anal gland surgery is preventing anal gland infection. 

These infections are usual in dogs and can occur when the glands become impacted.

Impacted glands can cause discomfort and pain for dogs and lead to infection and even abscesses. 

By anal gland removal dogs, one can prevent these problems, and the dog can get rid of the associated discomfort and pain.

Additionally, if a dog has a history of chronic anal gland problems, canine anal gland removal may be necessary to prevent future issues.

•  Elimination of Unpleasant Odors

Another benefit of anal sacculectomy is the elimination of unpleasant odors.

Anal gland fluid has a strong, unpleasant odor that can be quite potent. Actually, dogs use this fluid for communication and marking purposes.

However, it can result in an unpleasant smell that lingers in the home and on the dog's fur.

After removing the glands, the dog will no longer produce this fluid and annoying odor.

•  Reduction of Discomfort And pain in Dogs

In addition to preventing anal gland problems and eliminating unpleasant odors, dog gland removal can reduce dog discomfort and pain. 

Dogs with chronic anal gland issues can experience significant pain and discomfort. This develops into abscesses, which require surgical intervention. 

Through sacculectomy, these problems can be eliminated, and the dog can live a more comfortable and pain-free life.

•  Improved Quality of Life

Last and above all, gland removal improves a dog's overall quality of life.

Anal gland infections can cause severe discomfort and pain for dogs, resulting in a lower quality of life.

If the dogs undergo a gland removal procedure, they will get rid of pain and discomfort, resulting in a better higher quality of life.

Dog Anal Gland Removal Cons

While dog gland removal has many benefits, some drawbacks and risks should also be considered. 

Common canine anal gland removal cons are as follows.

•  Potential Risks And Complications Associated With Surgery

One significant con of dog gland removal is the potential risks and complications associated with surgery. 

In healthy dogs, these risks are relatively lower. However, they still need to be taken into consideration before going for the procedure. 

The resulting complications may include 

• Excessive bleeding
• Irreversible infection
• Adverse reactions to anesthesia
• Delayed sacculectomy recovery

•  Dog Anus Gland Removal Cost

Another consideration is the cost of the procedure. 

One should be well aware that dog gland removal can be costly, particularly if there’s an emergency or a specialist perform it. 

The average cost of the procedure ranges from $1,000 to $7,000.

Adding to it, the cost can be even higher if the dog experiences complications during or after the surgery, requiring additional veterinary care and monitoring.

•  Anal Gland Removal Dogs Impact on Digestive System

The impact on the dog's digestive system is also a concern with dog gland removal. 

The anal glands play a role in the dog's digestive process, and their removal can result in changes to bowel movements and digestive health. 

After the procedure, some dogs may experience 

• Diarrhea
• Constipation
• Other digestive issues

Therefore, it is important to monitor the dog's digestive health closely after the surgery. 

Moreover, pet owners should make necessary adjustments to their dog’s diet or medication.

•  Potential For Recurrence Of Anal Gland Problems

After the surgery, there is still a chance for the recurrence of anal gland problems.

While removal can prevent future issues with impacted or infected glands, there is still a risk of other anal gland problems, such as abscesses or tumors.

Apart from that, some dogs may continue to exhibit symptoms of anal gland issues, such as scooting or licking the anal area.

What Are the Alternatives to Anal Sac Removal?

Surgery should not automatically be the first treatment for routine anal sac disease.

Depending on the diagnosis, medical management may include:

Manual Expression

Impacted sacs can often be manually expressed.

However, repeated expression should be performed based on the individual patient's needs rather than automatically performed at arbitrary intervals.

Anal Sac Flushing

When material is too thick or difficult to express, flushing or infusion may help remove retained material.

Merck describes saline or softening agents for sacs containing dry or difficult-to-express material.

Antimicrobial Treatment

Antimicrobial therapy may be indicated when infection is present.

Treatment should be based on the clinical presentation and appropriate veterinary assessment rather than automatically prescribing antibiotics for every episode of anal sac disease.

Anti-inflammatory and Pain Management

Inflammation and pain should be managed according to the underlying disease and the patient's condition.

Stool Management

In selected dogs, supplemental dietary fiber can increase fecal bulk and potentially facilitate mechanical compression and emptying of the anal sacs during defecation.

However, dietary management should be individualized. It should not replace diagnostic investigation in dogs with recurrent or severe disease.

Treating Underlying Disease

If recurrent anal sac disease is associated with obesity, skin disease, allergies, abnormal stool consistency, or another contributing condition, addressing that condition may help reduce recurrence.

Anal Sac Removal vs. Anal Sac Expression

These procedures should not be confused.

Expression is therefore a management procedure, while sacculectomy is a definitive surgical procedure.

What Should Veterinarians Consider Before Recommending Sacculectomy?

Before elective anal sacculectomy, consider:

1. What is the underlying diagnosis?
2. How frequently has the disease recurred?
3. Has appropriate medical management been attempted?
4. Has an underlying contributing condition been identified?
5. Is there evidence of neoplasia?
6. Is the disease unilateral or bilateral?
7. Is there extensive inflammation, abscessation, or tissue distortion?
8. What is the patient's anesthetic and surgical risk?
9. Are the owners aware of potential postoperative fecal incontinence?
10. Would referral to a veterinary surgeon be appropriate?

The last consideration becomes especially important in complicated cases, including severe chronic infection, extensive scarring, recurrent disease, or suspected neoplasia.

Frequently Asked Questions

What is the biggest risk of anal sac removal?

One of the most important complications is fecal incontinence caused by injury to nerves associated with anal sphincter function. It may be temporary, but permanent incontinence can occur in rare cases.

Can a dog live normally after anal sac removal?

Yes. The anal sacs are not essential for normal digestion or survival. Their primary function is associated with scent communication.

How long does recovery take after anal sacculectomy?

Many dogs require approximately two weeks of restricted activity, although recovery varies according to the procedure and the patient's condition. Tumor cases or complicated infections may require more extensive postoperative management.

Can recurrent anal sac disease be treated without surgery?

Sometimes. Depending on the diagnosis, management may include expression, flushing, appropriate antimicrobial or anti-inflammatory treatment, stool management, and treatment of underlying disease. Surgery becomes more relevant when these measures fail.

What happens if an anal sac tumor is suspected?

The patient should undergo appropriate diagnostic and staging evaluation. This may include cytology or biopsy, bloodwork including calcium assessment, thoracic imaging, and abdominal imaging to assess regional lymph nodes and metastatic disease.

Should both anal sacs be removed?

Not necessarily. The decision depends on the disease affecting each sac, the patient's clinical history, and the surgeon's assessment. Removing both sacs also increases the importance of protecting the structures responsible for anal sphincter function.