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Monitoring means watching closely with a low threshold to escalate. If anything moves into a higher band, act on the higher band.
Eyes water and weep for reasons that range from a dusty walk to a sight threatening ulcer, so eye discharge is triaged on texture and company rather than on presence alone. Clear, watery overflow is tears winning against drainage, common in flat faced breeds whose anatomy spills tears onto the face, and in any eye briefly irritated. Thick discharge, white grey, yellow or green, is a different substance, mucus and pus from an inflamed or infected surface or from an eye that is too dry to wash itself clean, and it always earns a visit.
Company decides speed. Discharge with squinting, pawing, redness or a held shut eye is a painful eye until proven otherwise, and painful eyes hide ulcers, foreign bodies, glaucoma and internal inflammation, several of which cost vision in days. One eye versus two is also information: one sided signs favor a local cause, a scratch, a seed, a blocked tear duct or dry eye on that side, while both eyes together favor infection, allergy or a wider illness. Puppies bundle eye discharge with sneezing and poor appetite in the serious viral infections, which is why their band in the triage is lower. Never start leftover eye drops, and never use human drops, while you wait; some products, particularly steroid containing ones, can melt an ulcerated cornea.
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Expect a close eye examination with magnification, a tear production test, and fluorescein stain, the dye that makes corneal ulcers glow, because ruling an ulcer in or out changes every treatment decision. Pressure measurement follows where glaucoma is suspected, and the tear ducts may be flushed where one sided watering persists. Treatment is specific: antibiotic or lubricant drops for surface disease, dry eye medication where tear production has failed, removal of foreign material, and urgent referral where pressure or deep ulceration threatens the eye.
At home, wipe discharge gently with a damp, clean cloth, a separate area of cloth per eye to avoid carrying infection across, and stop the dog rubbing with a collar if pawing starts, because a rubbed ulcer deepens fast. Note which eye, the discharge color and thickness, and any squinting or light avoidance, and photograph the eye in daylight if the dog tolerates it. Do not delay a painful eye to complete a course of anything; eyes are the least forgiving tissue in this library. Nasal discharge traveling with eye discharge is covered in our runny nose guide.
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Thick yellow, green or grey white discharge is always a booking. Clear tears are usually overflow or brief irritation. Color alone does not diagnose, but thickness plus redness, squinting or pawing upgrades any discharge to a same day visit.
No. Human products can contain ingredients unsuitable for dogs, and any drop containing a steroid is dangerous on an ulcerated cornea, which cannot be excluded without stain testing. Your vet will prescribe for the actual finding.
One sided signs point to a local cause in that eye: a foreign body, a scratch or ulcer, a blocked tear duct, eyelid or lash problems, or dry eye affecting that side. Bilateral discharge more often reflects infection, allergy or general illness.
Tears that overflow onto facial fur stain it reddish brown through pigments in the tears themselves. Staining is cosmetic, but the overflow behind it deserves one good check for blocked ducts, lash problems or low grade irritation.
A cloudy or bulging eye, an eye held shut in pain, visible injury or bleeding, chemical exposure, or sudden vision change: those are emergency presentations where hours affect whether vision is saved.
This page is general information drawn from the published guidance of the organizations listed under Sources below. It is not veterinary advice, and it does not replace your own veterinarian, who knows your dog. If your dog may have eaten something toxic, contact your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 straight away. A consultation fee may apply on the helplines. If your dog is struggling to breathe, has collapsed, is having a seizure that will not stop, or has a swollen belly with retching that brings nothing up, go to an emergency veterinarian now and do not wait to finish reading.
Last updated: November 2026. Triage bands and facts checked against the sources listed above. How we work: our methodology.