My dog has eye discharge — is it serious?

A small amount of clear or slightly crusty discharge in the corners of the eyes is normal in dogs, especially after sleep. The colour, consistency, and quantity of the discharge will help you determine whether veterinary attention is needed.

Types of eye discharge and what they mean

- Clear, watery discharge – Often caused by allergies, irritation (wind, dust, smoke), or a blocked tear duct. Flat-faced breeds (Bulldogs, Pugs, Shih Tzus) are particularly prone to excessive tear production (epiphora) due to their facial anatomy.
- White or grey mucus – May indicate keratoconjunctivitis sicca (dry eye), where inadequate tear production leads to compensatory mucus discharge. Requires lifelong management.
- Yellow or green discharge – A strong indicator of bacterial conjunctivitis or a secondary infection. This type should always be evaluated by a vet.
- Brown staining below the eye – Chronic tear overflow (epiphora) stains the fur. Not usually a health risk but can predispose to skin irritation.

Common underlying causes

Conjunctivitis (pink eye), corneal ulcer, foreign body, entropion (eyelids rolling inward), cherry eye (prolapse of the third eyelid gland), or upper respiratory infection.

Home care

Gently wipe discharge from the corner of the eye with a clean, damp cloth. Use a different cloth for each eye to avoid cross-contamination. Do not apply human eye drops without veterinary advice.