Red, swollen/inflamed eyes in dogs

isolated dog


  • It's common for pet owners to assume that a red, sore looking eye points to infection, however, there are many different conditions that can cause similar symptoms.
  • Get in contact with your vet ASAP if you notice anything wrong with your dog's eye(s), a delay in treatment could lead to more severe problems.

General information

There are many different conditions that can cause red, inflamed, sore looking eyes in a dog. Help your vet by telling them about any other symptoms you have noticed, such as pain, swelling, discharge, excessive blinking, holding an eye shut or cloudiness.

Dog with red swollen eyes

Redness and swelling/inflammation in the eyes can be caused by many different conditions.


If your dog has red/swollen/inflamed eyes, they could be suffering from one of the following conditions:

  • Dry eye - a lack of tears.
  • An eye infection - caused by bacteria and commonly known as conjuctivitis.
  • Skin allergies - that cause itchy eyes (such as atopic dermatitis).
  • An eye ulcer - a wound on the surface of the eye that causes painful weepy, red, inflamed eyes.
  • Something irritating in their eye - such as smoke, dust, sand, wind, a grass seed, or a cat's claw! 
  • Eyelash disorders - eyelashes that rub on the surface of the eye often cause pain, redness and swelling.
  • Eyelid disorders - inward or outward turning eyelids often cause pain, redness and swelling/ inflammation.
  • Glaucoma - increased pressure in the eye. An eye with glaucoma will usually look red, inflamed, cloudy and larger than normal.
  • Exposure keratitis - a condition common in flat-faced dogs such as the Shih Tzu, Pug and Bulldog because their bulging eyes prevent proper blinking. Exposure keratitis causes the front of the eye to become dry and inflamed.
  • Uveitis - inflammation of structures inside the eye causes changes in the shape, size or colour of the iris.
  • Masses and tumours - often cause irritation and inflammation.

When to contact your vet

Contact your vet as soon as you notice anything wrong with your dog’s eyes, if they seem to be in pain, ask your vet for an urgent appointment. A delay in treatment could lead to much more serious problems and even loss of vision / blindness.

Consider insuring your dog as soon as you get them, before any signs of illness start. This will ensure you have all the support you need to care for them.

Published: February 2020

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Written by vets and vet nurses. This advice is for UK pets only.

Illustrations by Samantha Elmhurst