Where are dogs anal glands?

If your dog has ever scooted across the carpet, licked at the base of their tail, or left a sudden fishy smell in the room, you’re in the right place. Those behaviors often point owners toward the anal glands — small structures that can be perfectly normal but sometimes cause discomfort or infection. I’ll explain where those glands sit, why they matter, how they usually behave, when they become a problem, and what you can safely do at home before calling your veterinarian.

How anal glands affect your dog’s comfort and overall health

Dogs show a few common signs that make owners ask about anal glands. Scooting (dragging the rear on the floor), repeated licking at the anus, and a strong, fishy odor are the most frequent observations. I typically hear from owners who notice one of these behaviors after a messy stool or a stressful event, and they want to know if it’s an emergency.

Some situations require action rather than patience. A single brief episode of scooting or licking that resolves after a firm stool may not be serious. But persistent odor, repeated scooting, blood or pus near the anus, or visible swelling are reasons to pursue veterinary evaluation. Left untreated, an impacted gland may infect and form an abscess that is painful and may need surgical drainage.

There are also myths that circulate among dog lovers — for example, that all dogs need routine gland “expressing” every few months. In practice, many dogs never need manual expression. Understanding the signs that separate normal gland function from disease helps you avoid unnecessary or potentially harmful handling while recognizing when veterinary care is likely needed.

Exactly where a dog’s anal glands are located

Anal glands are two small sacs set in the wall of the anus at roughly the 4 and 8 o’clock positions when you view your dog from behind. Each sac is connected to the skin at the anal margin by a narrow duct that opens at the edge of the anus. You won’t usually see them unless they’ve been expressed, become swollen, or are being examined by a veterinarian, because the sacs sit just below the mucosal lining and are tucked into the soft tissue around the anal canal.

Anal gland anatomy: a clear, easy-to-follow overview

The sacs sit in a layer just under the mucosa of the anus — often described as part of the submucosal tissue around the anal canal. They are paired structures situated in small depressions called anal sacs, and each sac has a duct that opens at the anal margin. The openings are small and oriented slightly laterally, which is why the sacs sit at the 4 and 8 o’clock positions rather than directly opposite each other horizontally.

Size and visibility can vary. Smaller-breed dogs and overweight dogs may have sacs that are more prone to becoming impacted or difficult to empty because of narrow ducts or excess perianal fat. Puppies and very old dogs tend to have smaller or less robust secretory activity. Differences in body condition and anatomy mean that gland problems may be more noticeable in some dogs and essentially invisible in others until a problem develops.

Why dogs have anal glands — scent, signaling and other roles

Anal gland secretions are rich in volatile compounds and are used for scent communication. When a dog defecates, those secretions are often deposited with the stool and may convey individual and social information to other dogs. This is part of normal canine signaling and is likely linked to territory and individual identification behavior.

The secretions also have a minor role in lubricating stool as it passes the anus; in dogs with normal bowel movements this may help ease passage. Together, the social signaling and mechanical aspects explain why the glands are conserved across domestic dogs and many wild canids.

When anal glands express naturally and what that looks like

Most dogs will express at least a small amount of gland material during normal defecation, especially when there is strong intestinal and rectal contraction. Strong clean stools tend to encourage more complete emptying of the sacs compared with loose or watery stools, which may pass too quickly to press against the ducts effectively.

Emotional states can also trigger expression. Fear, excitement, and stress are common triggers for an involuntary release. You may see a dog leave a small odor after a vet visit or after meeting a new dog—this isn’t necessarily disease, just an acute release tied to emotion.

Diet and stool consistency play a major role in whether a dog tends to have problems. Low-fiber, soft stools or chronic diarrhea are likely linked to incomplete natural expression and can predispose a dog to impaction. Age and breed tendencies matter too: some small breeds and older dogs are more commonly affected.

Warning signs to watch for and when you should call the vet

Watch for persistent scooting, excessive licking of the rear end, apparent pain when sitting or defecating, and a recurring, strong fishy smell. Those signs may suggest impaction, inflammation, or infection. If you can feel a firm lump under the skin beside the anus, or if you see thick, brown, or bloody discharge — particularly pus — seek veterinary attention promptly.

Systemic signs raise the urgency. Fever, lethargy, loss of appetite, or marked behavioral changes alongside anal signs suggest a spreading infection or significant pain and merit prompt veterinary assessment. Recurrent problems (multiple episodes over weeks to months) are another red flag that an underlying anatomical or medical issue may exist.

Practical steps owners can take if you suspect an anal gland issue

1. Observe and document. Note timing, frequency, stool consistency, any odor, and whether events coincide with stress or changes in diet. A short video or photo can be helpful for your veterinarian.

2. Avoid forcing expression at home. Improper technique can push material into tissues, cause pain, or introduce infection. I generally recommend owners not attempt internal expression unless trained by a veterinary professional.

3. Address stool consistency first. A consistent, firm stool helps natural expression. Consider increasing fiber modestly — for many dogs a small amount of canned pumpkin or a vet-approved fiber supplement may help, but check with your veterinarian before starting supplements, especially for dogs on prescription diets or with other health issues.

4. Schedule a veterinary evaluation if signs persist, if you find a lump, or if there is pus or blood. At the clinic the team may manually express the sacs, check for infection, swab the material for cytology or culture if needed, and prescribe antibiotics or anti-inflammatories when appropriate.

5. Follow veterinary instructions for follow-up. Recurrent impaction may lead to recommendations such as regular professional expression, targeted dietary changes, or in some cases surgical removal of the sacs (anal sacculectomy) when conservative measures fail. Discuss risks and benefits with your veterinarian.

Training and environmental adjustments that help prevent problems

Long-term reduction of gland problems often begins with stable routines. Keep your dog on a consistent, high-quality diet and ensure adequate fresh water; both support healthy stools. Regular exercise also supports bowel regularity and can reduce the risk of chronic soft stools.

Regular gentle handling and grooming around the hindquarters can desensitize dogs to touch in that area, making vet checks and any necessary procedures less stressful. Use short, positive sessions with treats to build tolerance to brief perianal inspection by you or a groomer so that problems are noticed earlier.

Training a dog to accept basic veterinary handling — having them stand on a scale, lifting a tail briefly, tolerating a gentle exam — reduces stress when professional care is needed. Routine wellness visits give your veterinarian the chance to spot repeat issues early and discuss whether periodic professional expression or other interventions are warranted.

Useful tools, grooming products and supplies to keep on hand

• Disposable gloves and pet-safe, alcohol-free wipes for gentle surface cleaning if there’s minor leakage or odor.

• Absorbent pads or short-term recovery bedding if a dog has an episode with discharge, to protect floors and help you monitor ongoing leakage.

• High-fiber diet options or veterinary-approved fiber supplements; discuss exact products and dosing with your veterinarian before starting them.

• A secure transport crate or a well-fitted harness to safely get your dog to the clinic if they appear painful or reluctant to move.

References, veterinary resources and further reading

• Merck Veterinary Manual: “Anal Sac Disease in Dogs and Cats” — Merck Veterinary Manual online entry, clinical overview and management.
• Cornell University College of Veterinary Medicine: “Anal Sac Problems in Dogs” — Companion Animal Hospital client information and clinical notes.
• American Veterinary Medical Association (AVMA): Client education materials on anal gland disease and perianal conditions in dogs.
• Fossum, T.W., Small Animal Surgery, 5th Edition — chapter covering perianal surgery and anal sac disease, for surgical indications and technique.