Anal Sac Disease in Dogs

Anal Sac Disease in Dogs

By: Dr. Cathy Reese

Section: Overview

The anal sacs are glands located near the anus (rectum) that produce secretions that are normally expressed during defecation. The secretions from these glands are normally pungent (in fact, very smelly) and straw-colored with brown flecks. Anal sac contents may also be expressed in times of fright (producing a terrible odor in the area).

Dogs are more commonly affected with anal sac disease than cats, and small breed dogs are more commonly affected with anal sac impaction than large breed dogs. Older female dogs are more commonly affected with anal sac tumors.

Types of anal sac disease include:

  • Impaction, which can lead to inflammation or infection of the anal sacs
  • Inflammation
  • Infection or abscess formation
  • Tumors of the sac or related glandular tissues

    What to Watch For

  • Scooting or dragging the anus on the ground or carpet
  • Frequent licking of the anus or tail base
  • Reluctance to sit or sitting asymmetrically to avoid pressure on the painful anal sac
  • Straining to defecate, difficulty defecating, production of ribbon-like stools
  • Painful swelling at the 4 o'clock or 8 o'clock locations around the anus

    Similar signs can be seen in dogs with a different disease called perianal fistula, a severe condition that causes draining tracts around the anus. The breeds that most commonly develop perianal fistulae are German shepherd dogs and Irish setters.

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