Dog Anal Glands: Common Problems, Signs and Treatment

Vet verified. Written by Dr. Linda Simon MVB MRCVS, Team Vet. Reviewed by Elle Padgham, Communications Lead.

Dog anal glands, more accurately called anal sacs, are two small scent sacs just inside the anus at roughly the four- and eight-o’clock positions. Most empty naturally when a dog passes firm stool. When material is retained, a sac can become impacted, inflamed, infected or abscessed. A firm nonexpressible sac can also be a sign of a tumor and needs investigation.

Scooting is the sign people recognize, but it is not a diagnosis. Worms, allergies, skin disease, pain, diarrhea, constipation and material caught in the coat can all make a dog drag, lick or turn toward the rear. A veterinary examination separates those causes and shows whether the sacs actually need treatment.

Dog anal gland problems at a glance

Finding	What it may mean	Best next step
One brief fishy odor during fear or excitement	Normal spontaneous release is possible	Clean the area and monitor if the dog is otherwise normal
Repeated scooting or licking	Anal sac discomfort, parasites, allergies or skin irritation	Book a veterinary examination
Pain when sitting or passing stool	Impaction, inflammation, abscess or another anorectal problem	Prompt veterinary assessment
Red, hot or rapidly enlarging swelling	Infection or abscess	Same-day veterinary contact
Blood, pus or a draining hole beside the anus	Ruptured abscess or another wound	Urgent veterinary care
Firm one-sided lump or nonexpressible sac	Infection, severe impaction or neoplasia	Imaging, sampling or biopsy may be needed
Increased thirst and urination with a mass	Possible hypercalcemia associated with anal sac adenocarcinoma	Prompt examination and blood testing

What are anal glands in dogs?

The paired sacs sit beneath the skin on either side of the anal opening. Their walls contain glands that produce a strong-smelling brownish liquid. A small duct from each sac opens just inside the anus. Muscle contraction and pressure from a bowel movement normally release a small quantity onto the stool.

People often say anal glands, but anal sacs is the more precise term. A healthy sac cannot be seen from outside. Its exact position, size and feel are assessed during a careful rectal examination. The concept illustration below shows the paired arrangement only; it is not a guide for finding or squeezing the sacs at home.

What do anal sacs do?

The secretion contributes to scent communication. Dogs can release it with a normal bowel movement and may empty a small amount when frightened or excited. One isolated odor does not automatically mean disease. Repeated odor plus scooting, licking, pain, swelling or discharge is different and should be assessed.

Do all dogs need routine expression?

No. Most dogs never need scheduled manual expression. Emptying normal sacs too frequently can irritate the ducts and tissue. A dog with confirmed recurrent retention may need an individual plan, but the interval should be based on symptoms and veterinary findings rather than a grooming-calendar default.

How to tell if a dog’s anal glands are full or painful

Behavioral signs

• Scooting or dragging the rear across carpet, grass or flooring
• Repeated licking, biting or chewing near the anus, tail base, rump or rear legs
• Turning suddenly to look at the rear or chasing the tail
• Sitting abruptly, sitting unevenly or refusing to sit
• Straining, crying or repeatedly posturing when passing stool
• Growling, flinching or snapping when the tail or rear is touched
• Reduced appetite, hiding or unusual restlessness when pain is more severe

Physical signs

• A sudden fishy or foul odor
• Redness, heat, swelling or a lump beside the anus
• Brown, gray, green-yellow or blood-tinged discharge
• A small draining opening in the skin beside the anus
• Hair loss, moist skin or sores caused by repeated licking
• Constipation, narrow stool or visible discomfort during defecation

When anal sac signs are urgent

Severe pain, a rapidly growing or hot swelling, blood, pus, an open wound, fever, weakness, repeated vomiting, inability to pass stool, collapse or a firm mass needs prompt veterinary care. An abscess can rupture through the skin and remains painful even after pressure is released. A normally gentle dog may bite when the area hurts, so do not press, probe or restrain the dog for a home inspection.

Scooting can come from something else

Common alternatives include tapeworm segments, other parasites, allergic skin disease, fleas, a moist skin infection, diarrhea residue, a matted coat, vulvar irritation, constipation, an orthopedic problem, a perineal hernia and a foreign object. Repeated expression will not fix those causes and may delay the correct treatment.

Common dog anal gland problems

Anal sac impaction

Material becomes thick, dry or difficult to release through the duct. The sac enlarges and pressure causes discomfort. Merck Veterinary Manual notes that reduced emptying during defecation, poor muscle tone in obese dogs and excessive glandular secretion can contribute to retention. Impaction can be present on one or both sides.

Anal sacculitis and infection

Retained contents can support bacterial overgrowth and inflammation. The fluid may become discolored or bloody, and the dog can be very painful. Recurrent infection may justify cytology or bacterial culture so antimicrobial treatment is selected from evidence rather than guesswork.

Anal sac abscess

An obstructed infected sac can fill with pus and create a red, hot swelling. It may rupture and form a tract through the skin. Blood or green-yellow discharge from a small hole beside the anus is a typical emergency presentation. The dog still needs pain relief, cleaning and veterinary treatment after rupture.

Perianal fistula is not the same problem

Perianal fistulas are chronic inflammatory tunnels and ulcers around the anus, seen particularly in German Shepherd Dogs and related breeds. They must be distinguished from a tract created by a ruptured anal sac abscess because treatment differs. Any chronic hole, ulcer, odor or discharge needs examination.

Anal sac adenocarcinoma

Apocrine gland anal sac adenocarcinoma is uncommon but serious. It often forms a firm, enlarged, one-sided sac and may spread even when the primary mass is small. The American College of Veterinary Surgeons reports that approximately one quarter of cases can cause high blood calcium. Increased thirst, increased urination, vomiting, reduced appetite, weakness or kidney problems can follow.

A veterinarian may recommend a needle sample or biopsy, blood tests including calcium, chest imaging and abdominal imaging to assess lymph nodes and other organs. Early detection during a routine examination matters because some dogs have few outward signs.

What causes recurring anal gland trouble?

Stool consistency

Firm, appropriately sized stool can help compress the sacs during defecation. Chronic soft stool, diarrhea or constipation may reduce reliable emptying or create additional irritation. Stool quality is an observation, not a diagnosis. Parasites, diet intolerance, inflammatory disease, infection, medication and many other conditions can change it.

Body condition and muscle tone

Overweight dogs are overrepresented in recurrent anal sac disease. Extra tissue and reduced muscle tone may interfere with natural emptying. A body-condition score is more useful than comparing the dog with an online breed weight. Weight loss should be gradual and based on measured calories, not sudden food restriction.

Skin allergy and inflammation

Dogs with allergic skin disease may lick the rear and can have inflammation near the ducts. Treating confirmed allergy and secondary infection may reduce recurrence. Do not assume that every scooting dog has food allergy or switch diets repeatedly without a structured veterinary plan.

Anatomy and secretion characteristics

Some dogs appear to have narrower ducts, deeper sacs or thicker secretions. Small breeds are predisposed, but any size can be affected. Anatomy cannot be corrected by adding random fiber or scheduling expression without confirming a need.

Does an unbalanced microbiome cause anal gland disease?

Gut health can influence stool consistency, and stool consistency can affect natural sac compression. That does not prove that a single microbiome imbalance directly caused an individual dog’s impaction. Recurrent loose stool deserves a veterinary digestive workup rather than an unvalidated home test or a sequence of supplements.

Are some breeds at increased risk?

Small-breed dogs are more commonly affected by impaction and inflammation, while large and giant breeds are less commonly affected. Obesity, chronic skin disease, stool problems and individual anatomy can matter more than breed alone. A large dog with pain or swelling needs the same prompt assessment.

Anal sac adenocarcinoma is a different condition. ACVS notes that it can occur in any breed, is more common in Spaniel breeds and affects male and female dogs at roughly equal rates. Older dogs are more often affected, but age does not rule a mass in or out.

Do puppies need their anal glands expressed?

A healthy puppy should not need routine expression. Repeated scooting in a puppy can come from soft stool, worms, allergies, coat contamination or anal sac disease. Arrange an examination rather than practicing expression on a small, wriggly puppy. Puppies can become dehydrated quickly when diarrhea or vomiting is present.

Do not diagnose worms only by looking for visible material. Some parasites are microscopic, and rice-like tapeworm segments may appear intermittently. A fecal test and an age-appropriate parasite plan from the veterinarian are more reliable. Browse our puppy health and care guides while you prepare for the veterinary visit.

How a veterinarian diagnoses anal sac disease

The clinician starts with history: how long the signs have lasted, stool consistency, diet, parasite prevention, allergies, medication, previous expression and whether a mass or infection has occurred before. The physical examination includes the skin, tail, perineum, body condition and a gentle rectal assessment when safe.

Tests that may be needed

• Cytology to examine cells, inflammation and microorganisms
• Bacterial culture for recurrent or resistant infection
• Fecal testing when parasites or chronic stool changes are possible
• Blood and urine tests when systemic illness or high calcium is suspected
• Ultrasound or other imaging to assess a firm sac and regional lymph nodes
• Needle sampling or biopsy when neoplasia is possible

A normal-looking exterior does not rule out a deep problem, and a fishy odor alone cannot distinguish normal release from impaction or infection.

How dog anal gland problems are treated

Diagnosis	Possible veterinary treatment	Important limitation
Simple impaction	Gentle expression; softening and flushing if material is dry	Only after examination confirms impaction
Inflammation or infection	Cleaning, local medication, pain control and antimicrobials when indicated	Culture may be needed in recurrent cases
Abscess	Drainage, flushing, pain relief, medication and rechecks	Sedation or surgery may be required
Recurrent severe disease	Underlying-cause plan; surgical removal in selected cases	Anal sacculectomy carries wound and continence risks
Anal sac tumor	Staging, surgery and possible oncology treatment	Plan depends on mass size, spread and calcium status

Do not give leftover antibiotics or human pain medication. Ibuprofen, naproxen and acetaminophen can be dangerous to dogs. Do not apply essential oils, alcohol, peroxide, diaper cream or human hemorrhoid products to the area unless the veterinarian has prescribed that exact product.

What happens after an abscess ruptures?

A ruptured abscess may look better because pressure has fallen, but the wound is contaminated and painful. The veterinary team may clip and clean the area, flush the tract, prescribe pain relief or other medication, recommend warm compresses and use a protective collar. Follow the exact cleaning and recheck schedule provided.

When is surgery considered?

Anal sacculectomy may be considered when medical management repeatedly fails, quality of life is poor or a tumor is present. Nerves and muscles controlling defecation are close to the sacs, so fecal incontinence, wound problems and narrowing are recognized complications. A board-certified veterinary surgeon may be appropriate for complex disease or cancer.

Can I express my dog’s anal glands at home?

Only consider home expression when a veterinarian has diagnosed a recurring need, ruled out a mass or abscess and trained you hands-on for that individual dog. A generic online video cannot tell you whether the sac is normal, impacted, infected or neoplastic. Incorrect pressure can cause pain, bruising, duct injury, rupture or a bite.

Do not attempt expression when the dog has severe pain, swelling, discoloration, blood, pus, an open tract, fever, constipation or a firm mass. Do not force a frightened dog to remain still. If material does not release easily during a veterinarian-approved technique, stop and call the clinic.

Should a groomer express anal glands?

Policies and training vary. External expression may not fully empty a diseased sac and does not replace a rectal examination. A dog with repeated signs, pain, abnormal discharge or a history of infection belongs with the veterinarian. Routine expression of normal dogs is not a preventive requirement.

Can diet and fiber help anal glands?

Merck notes that supplemental fiber can increase fecal bulk and help compress the sacs during defecation. That does not mean every dog needs the same fiber or that fiber treats an active infection, abscess or tumor. Soluble and insoluble fibers affect water, fermentation and stool differently. Too much or a sudden change can produce gas, diarrhea, constipation or poor intake.

Ask the veterinarian to review the complete diet, calories, stool pattern and medical history before adding pumpkin, psyllium or a commercial fiber product. Dogs with dehydration, obstruction risk, megacolon, pancreatic disease or a prescribed diet may need a different plan. Introduce an approved change gradually and keep water available.

Body weight and exercise

Regular activity supports body condition and normal bowel habits, but exercise cannot empty an infected or obstructed sac on command. Use a veterinary target weight and body-condition score. Weigh food, count treats and increase activity within the dog’s orthopedic, cardiac and respiratory limits.

What should I track?

• Stool consistency, frequency and straining
• Scooting, licking, odor, pain and which side appears swollen
• Diet, treats, chews, supplements and recent changes
• Body weight and body-condition score
• Skin and ear flare-ups
• Dates of expression, infection, medication and rechecks

Bring the log and clear non-graphic photos to the appointment. A pattern across weeks is more useful than relying on memory.

How to reduce the risk of repeat problems

1. Investigate chronic diarrhea, constipation or variable stool instead of masking it.
2. Keep parasite prevention and fecal testing appropriate for the dog’s risk.
3. Treat diagnosed skin allergy and secondary infection.
4. Maintain a lean body condition with measured food and suitable activity.
5. Use fiber only when its type and amount fit the complete diet.
6. Avoid routine expression unless the dog has a documented recurring need.
7. Attend rechecks after infection, abscess, unusual discharge or surgery.
8. Ask the veterinarian to assess the sacs during routine examinations, especially in an older dog or after a previous mass.

Frequently asked questions

How do I know if my dog needs anal glands expressed?

Scooting, licking, fishy odor and painful defecation can suggest anal sac discomfort, but those signs have other causes. A veterinary examination is the safest way to confirm impaction and rule out infection, parasites, allergy or a mass.

How often should dog anal glands be expressed?

Most dogs never need routine expression. A dog with recurring confirmed impaction may need an individual interval based on symptoms and examination. There is no universal four-week or six-week requirement.

Can full anal glands clear on their own?

Mild retention may empty during a normal bowel movement, but persistent discomfort should not be watched indefinitely. Infection and abscess can worsen quickly, and a firm sac may need investigation.

Is a fishy smell always an anal gland problem?

A sudden fishy odor often comes from anal sac fluid, including a normal fear-related release. Odor alone cannot show whether the sacs are normal, impacted or infected. Repeated odor with pain, swelling or discharge needs assessment.

Can I use pumpkin for my dog’s anal glands?

Pumpkin supplies fiber and water, but it is not the right choice or amount for every dog and does not treat active disease. Ask how it fits the dog’s complete diet, calories, stool pattern and medical conditions.

Does scooting mean my dog has worms?

Worms are one possibility, but anal sac discomfort, allergy, diarrhea residue and skin disease are also common. A fecal test and physical examination are more reliable than guessing from scooting alone.

Can an anal gland abscess heal without a vet?

Do not rely on home healing. An abscess is painful and may require drainage, flushing, medication and rechecks. A ruptured abscess still needs veterinary care.

Why does my dog still scoot after expression?

Temporary irritation is possible, but persistent scooting may mean incomplete emptying, infection, allergy, parasites, skin damage or another anorectal problem. Contact the clinic that examined the dog.

Can anal gland disease cause constipation?

Yes. Pain can make a dog avoid defecation, and swelling or a mass can contribute to straining or narrow stool. Inability to pass stool, repeated unproductive straining or severe pain needs prompt care.

Can anal gland problems become cancer?

Impaction does not simply turn into cancer, but a tumor can arise in an anal sac and may resemble or coexist with other disease. A firm, enlarged or nonexpressible sac needs diagnostic testing.

Trusted sources

• Merck Veterinary Manual: anal sac disease in dogs and cats
• Merck Veterinary Manual: rectal and anal disorders in dogs
• American College of Veterinary Surgeons: anal sac tumors in dogs
• VCA Animal Hospitals: anal sac disease in dogs

Continue with the best dog food for anal gland issues, dog stomach gurgling, blood in puppy stool and the complete dog health guide hub. Browse dog supplements only after identifying the dog’s actual need.

This guide is educational and does not replace a veterinary examination. Severe pain, swelling, blood, pus, an open wound, fever, weakness or inability to pass stool needs prompt care.