Dog anal glands: when it is a problem and what to do

The anal sacs are two small pouches lying just under the skin, on either side of the anus, roughly at the four o'clock and eight o'clock positions if you picture a clock face around the opening. Each collects the secretion produced by the glands lining it: a strong smelling, deeply unpleasant fluid, highly individual, that the dog uses as a signature. When the animal defecates, the pressure of the stool against the walls of the canal pushes the sac contents out through two tiny ducts, and a trace of that odour is left on the stool. It is the reason dogs sniff each other under the tail: they are reading a chemical identity card.

In a healthy dog all of this happens without anyone noticing. The owner sees nothing, smells nothing unusual outside moments of fear or strong emotion, and the dog shows no discomfort. Precisely because the system is silent when it works, any signal that makes it visible deserves attention: it means spontaneous emptying is no longer happening as it should.

Anal sac discomfort produces a small, very recognisable repertoire of behaviours. Taken singly they can have other explanations, but together they nearly always point in the same direction. The table below relates each one to what it may indicate and to the first reasonable thing to do.

A useful principle: occasional scooting, right after a slightly soft stool, may be an isolated episode of no importance. Scooting that repeats every day, licking that does not settle, and any visible swelling or discharge are instead signals not to ignore. Recording when they appear and how long they last in the Animiyo diary, under /health-diary, helps separate an episode from a trend, and gives the vet a precise timeline rather than a rough memory.

Speaking loosely of anal glands causing trouble blurs situations that differ greatly in severity and urgency. It helps to keep them distinct, because the response changes.

• Full: the sac has not emptied completely and is accumulating secretion. The dog feels pressure and discomfort, scoots or licks, but the area is not yet inflamed. This is the mildest and most common stage.
• Impacted: the secretion thickens and the ducts obstruct, so the sac can no longer empty on its own. Discomfort increases and, without intervention, the situation tends to worsen rather than resolve.
• Inflamed or infected: inflammation develops inside the sac, often with bacteria. There is sharper pain, heat and sometimes secretion of abnormal colour or odour. A veterinary assessment is needed, frequently with treatment.
• Abscess: the infection forms a collection of pus that stretches the skin beside the anus until it ruptures, releasing foul smelling and often bloody material. This is the most painful form and needs urgent treatment.

Expression, meaning emptying the sacs manually by applying pressure on either side of the anus, is a decisive intervention when the sacs are full or impacted and cannot clear on their own. It makes sense when there is a clear indication: a dog showing the signs described, in which the vet or trained staff confirm the sacs really are full. In that case emptying removes the discomfort within minutes.

The delicate point is another one: expressing the sacs out of habit, at every bath or on a fixed schedule, in a dog that does not need it, is not good practice. Repeated, unnecessary stimulation can irritate the ducts, encourage inflammation and, according to many clinicians, make the sacs less able to empty on their own, creating a dependence on the manoeuvre. A dog that empties by itself should be left alone. Routine expression, moreover, if done badly, can cause local trauma. This is why the choice of whether and when to empty belongs to someone who can assess the actual filling, not to a calendar.

Spontaneous emptying depends on the pressure a stool of good consistency exerts on the walls of the canal as it passes. This is where daily management makes the difference, because several modifiable factors influence how well the system works.

• Stool consistency: stools that are too soft do not exert enough pressure and the sacs receive no stimulus to empty. Repeated episodes of soft stool often underlie scooting.
• Fibre intake: adequate fibre helps give bulk and shape to stool. Diet changes aimed at this, however, should be agreed with the vet, not improvised.
• Overweight: fat around the perianal area can hinder the mechanical emptying of the sacs. Overweight dogs tend to have more problems, and weight control is part of prevention.
• Allergies and dermatitis: allergic skin disease can inflame the perianal area and the ducts, encouraging recurrent impaction and infection. In a dog with repeated problems the skin should be assessed as a whole.
• Diarrhoea and intestinal parasites: they alter stool consistency and should be resolved at the root, because until the stool normalises the problem tends to return.

None of these factors should be managed with improvised solutions found online. Diet changes, fibre supplements and weight plans make sense within an overall assessment, because the same scooting can arise from very different causes and the right response depends on the cause. Recording stool consistency and weight in the Animiyo diary gives the vet concrete elements to reason with.

Faced with a dog that scoots or licks, an orderly observation avoids both needless alarm and underestimating an emergency. These steps help you work out which scenario you are in.

1. 1

   Look at the perianal area calmly

   With the dog relaxed, observe the skin on either side of the anus. Look for swelling, redness, warm areas, discharge or small wounds. Do not press or manipulate: the aim is to see, not to intervene.

2. 2

   Note the link with defecation

   Record whether the discomfort appears mainly after defecating, whether the dog strains or yelps when passing stool, and what the stool consistency is like. These details strongly guide the diagnosis.

3. 3

   Tell the isolated episode from the repetition

   Occasional scooting after a soft stool may resolve on its own. Daily scooting, or scooting lasting several days, shows the problem is not closing spontaneously.

4. 4

   Recognise the signs of urgency

   A painful swelling, local heat, purulent or bloody discharge, obvious pain on defecating or a dull, subdued dog call for a same day visit, without waiting to see how it evolves.

5. 5

   Record everything in the diary

   Note in /health-diary the date, the type of signal, the frequency and photos of the area. An orderly history of episodes is worth more than a recollection and helps catch problems that keep returning.

6. 6

   Ask the vet instead of expressing

   If the picture is unclear, a consult via /vet or an urgency check with /triage guides you better than a do it yourself manoeuvre. Expression, if needed, is decided by whoever has seen the sacs.

In older dogs, a swelling beside the anus is not always a simple full sac or an abscess. There are anal sac tumours that can present as a mass in the same location, sometimes discovered during a check for a suspected gland problem. It is not the most common explanation for scooting, and this article is not meant to make a diagnosis, but it is the reason why any persistent swelling in that area, especially in a senior dog, should be assessed rather than dismissed as a trivial nuisance.

The closing message of this section is the same as the whole article: the anal sac system is silent when it works, and every time it becomes noisy, with scooting, licking, pain, swelling or discharge, it is asking for attention. The degree of urgency varies greatly, from a simple full sac to an abscess to a mass to investigate, and telling them apart is a clinical task. The owner's role is to observe well, record consistently and bring the vet a clear picture.