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Anal glands: spotting the discomfort (and why not to do it yourself)
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Anal glands: spotting the discomfort (and why not to do it yourself)

Your dog drags his bottom along the floor, licks his rear end or smells of fish? His anal glands may be full. Normally, they empty on their own. Your job: spot the signs and hand him over to the right professional.

What anal glands are for

A dog has two small sacs sitting either side of the anus. They hold a secretion with a very distinctive smell, a sort of scent identity card he leaves behind to mark his passage. In most dogs, these sacs empty by themselves with every well-formed stool: nothing to do, the body takes care of it.

Spotting the signs day to day

  • He drags his bottom along the floor, rear down, like a sledge across the carpet.
  • He licks or nibbles insistently at his rear end, often in the same spot.
  • He struggles to sit down, squirms or gets straight back up, as if sitting bothered him.
  • A strong fishy smell that lingers, around him or on his bed.

The vet, the safe reflex

  • He empties the sac safely, and the pain settles.
  • He looks for why it keeps happening (stools, weight, allergy, infection).
  • He treats an abscess, an infection or pain.

A trained groomer, for upkeep

  • They can do a comfort expression on a dog whose glands empty poorly.
  • They only act when there is no swelling, no pain and no blood.
  • At the slightest abnormal sign, it is back to the vet.

Helping his glands empty on their own

Well-formed stools naturally press on the glands each time they pass. Here is what really helps.

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Some signs can wait a little, others mean the vet straight away.

Worth a check-up

  • He keeps dragging his bottom or licking his rear end after several days.
  • The blockages keep coming back.

Without delay

  • A red, hot, painful swelling near the anus.
  • A discharge of blood or pus, possibly an abscess of the gland.
  1. Anal Sac Disease in Dogs, Merck/MSD Veterinary Manual
  2. Corbee R. J. et coll.A Cross-Sectional Study on Canine and Feline Anal Sac Disease, Animals (2022)

Going further

Frequently asked questions

How do I know if my dog's anal glands are full?

You can tell his glands are full without handling anything: the dog drags his bottom along the floor, licks or nibbles his rear end, struggles to sit down, or gives off a lingering fishy smell. These are signs to observe and report to the vet, not to confirm yourself by pressing the area.

Why empty a dog's anal glands?

In most dogs, the glands empty on their own as well-formed stools pass: there is no routine expression to do. The vet only steps in when they are genuinely full and it is bothering him. Emptying a dog with no symptoms out of habit can even keep the problem going; it is the vet who judges whether it is needed.

Who can empty a dog's anal glands?

The vet, or a trained groomer, never you by force. Manual expression is a technical procedure: done badly, it risks injuring the area or causing an abscess. At the slightest swelling, pain or discharge of blood or pus, it is the vet, not the groomer.

My dog drags his bottom along the floor, what does it mean?

It is often a sign of anal glands bothering him, but not always: other problems (fleas, a skin allergy, worms) can cause the same behaviour. Rather than concluding yourself or pressing the area, watch how often it happens and have your dog examined. The vet traces it back to the real cause before treating.

How often should a dog's anal glands be emptied?

There is no universal schedule: a dog whose glands empty perfectly well on their own has no reason to be expressed regularly. The frequency depends on each dog and is decided with the vet, based on symptoms, never "just in case".

How do I prevent anal glands from becoming blocked?

The best way is regular transit with nice firm stools, which naturally press on the glands each time they pass. An ideal weight, good hydration, physical activity and suitable food (fibre on the vet's advice) help a lot. If the problem comes back anyway, talk to your vet.

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