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Canine Pannus


The cornea is a see-through tissue that covers the eye. Pannus, also known as Chronic Superficial Keratitis, is inflammation of the cornea. It is not painful but will affect your dog's vision.

If Pannus is left untreated, it can be blinding. 

Pannus occurs mainly in German Shepherds, but it can occur in other breeds.


Pannus is immune-mediated (the immune system fights the cornea).

It can be triggered and aggravated by other things, including:

  • Ultraviolet light
  • Pollution
  • Smoke
  • High altitude


Typically, both eyes are affected.

  • First, you will notice a pink film on the eye
  • As Pannus progresses, the film will spread and turn brown
  • Eventually, there will be vision loss

Other signs you may notice:

  • Excessive tearing
  • Opaque cornea
  • Thickened, pink third eyelid


Diagnosis is usually based on medical history and signs.

To rule out other diseases, your veterinarian may perform the following tests:

  • Biopsy of the cornea
  • Corneal staining with fluorescein
  • Intraocular pressure testing (IOP): checks for glaucoma
  • Schirmer tear test: checks for tear deficiency


Pannus can not be cured entirely but is controllable. Treatment will stop the disease from progressing and may reverse some of the damage.

Treatment may include:

  • Cortisone: either applied on the skin or injected by your veterinarian
  • Antibiotics: drugs to suppress the immune system or to treat any secondary infections
  • Surgery: in cases where the dog is blind, the top layers of the cornea can be removed
  • Radiation: may be an option for advanced Pannus


Pannus itself is not preventable, but you can try to prevent relapses.

Affected dogs should:

  • Limit exposure to bright sunlight (unique sunglasses are available to protect your dog's eyes)
  • Limit walks to early morning, evening, or shady areas


Life-long treatment is often necessary. You must follow your veterinarian's instructions with giving medication. Following up with your veterinarian is also important because they may need to adjust the medication.

Most dogs respond well if you give the medication correctly.

Medically Reviewed by Sara Ochoa, DVM

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