Anal glands (anal sacs) are two small glands located at the 4 and 8 o'clock positions flanking the anus. They produce a pungent, oily secretion that dogs use for territorial marking and identification. In a healthy dog, the glands express naturally during defecation. When they don't empty properly, they become impacted, infected, or abscessed — causing significant discomfort and the distinctive "scooting" that owners notice.
Normal Function
Each anal gland has a duct that opens at the anal margin. During defecation, the pressure of firm stool passing compresses the glands, expressing their secretion onto the stool surface. This is why:
- Dogs with consistently firm stools rarely have anal gland problems
- Dogs with chronic soft stools (allergies, GI issues, poor diet) commonly develop problems
- Small breeds have proportionally smaller ducts that block more easily
Common Problems
| Condition | Signs | Severity | Treatment |
|---|---|---|---|
| Impaction | Scooting, licking at rear, discomfort sitting | Mild | Manual expression (vet or groomer) |
| Infection (sacculitis) | Pain, swelling beside anus, bloody/purulent discharge, fever | Moderate | Expression + flushing + antibiotics |
| Abscess | Hot, red, swollen mass beside anus; may rupture externally (messy and painful) | Severe | Lance and drain under sedation, antibiotics, pain management |
| Anal gland tumor (adenocarcinoma) | Firm mass near anus, may cause hypercalcemia, often found incidentally | Serious | Surgical removal + staging for metastasis |
When to Express
- Only when needed — routine prophylactic expression is controversial. Some vets believe it weakens the gland muscles over time.
- Signs expression is needed: Scooting, licking at rear, fishy smell, visible discomfort
- Who should do it: Veterinarian (internal expression — more thorough) or experienced groomer (external expression — less thorough but less invasive)
Prevention
- High-fiber diet: Bulky, firm stools compress glands naturally during defecation. Add canned pumpkin (1-3 tablespoons/day) or psyllium fiber supplement.
- Maintain ideal weight: Obese dogs have more anal gland issues.
- Address allergies: Chronic allergic inflammation affects anal gland duct patency.
- Regular exercise: Promotes regular, healthy bowel movements.
Anal Gland Removal Surgery (Sacculectomy)
For dogs with chronic, recurrent problems (impaction every 2-4 weeks despite preventive measures):
- Removes both anal glands permanently
- Eliminates the problem definitively
- Risk: fecal incontinence (1-5% if performed by experienced surgeon)
- Cost: $800-$2,000
- Recovery: 2-3 weeks
Frequently Asked Questions
Why does my dog scoot?
Scooting = anal discomfort. Most common causes: full/impacted anal glands (70%), allergies causing perianal itch (20%), tapeworms (5%), perianal fistula/mass (5%). If scooting persists after expression, investigate other causes.
Does every dog need regular anal gland expression?
No. Most dogs never need manual expression — their glands function normally. Routine expression is only needed for dogs with recurring impaction issues. Don't request expression at every grooming visit "just in case" — it may do more harm than good in a dog with normally functioning glands.
