Dog Eye Discharge: Colors, Causes & Treatment

Q: What does the color of my dog's eye discharge mean?

Clear, watery discharge is usually caused by allergies, wind, or minor irritation and is often normal. White or grayish discharge can indicate dry eye (keratoconjunctivitis sicca). Yellow or green discharge strongly suggests a bacterial infection and requires veterinary treatment with antibiotic eye drops. Brown or reddish-brown staining around the eyes is typically caused by tear overflow (epiphora) and is common in breeds like Poodles, Maltese, and Shih Tzus. Bloody discharge indicates trauma, a foreign body, or a serious eye condition and needs immediate vet attention.

Q: How can I clean my dog's eye discharge at home?

Use a clean, damp cloth or pet-safe eye wipe to gently wipe from the inner corner of the eye outward. Use a separate cloth for each eye to avoid spreading infection. For crusty buildup, dampen the area first and let it soften before gently removing it. You can also use a sterile saline eye wash to flush out mild irritants. Never use human eye drops (Visine, Clear Eyes) on your dog without vet approval, as some contain ingredients toxic to dogs.

Q: Why does my dog have brown tear stains?

Brown or reddish-brown tear stains are caused by porphyrins, iron-containing compounds naturally present in tears. When tears overflow onto the fur (epiphora), porphyrins oxidize and stain the hair. This is especially common in white and light-colored breeds, brachycephalic breeds (Bulldogs, Pugs), and breeds with shallow eye sockets (Shih Tzus, Poodles, Maltese). While usually cosmetic, persistent excessive tearing should be checked by a vet to rule out blocked tear ducts or eye irritation.

Q: Can dog eye discharge be contagious?

Yes, some causes of eye discharge are contagious between dogs. Canine distemper, bacterial conjunctivitis, and viral infections can spread through direct contact, shared toys, or shared water bowls. If your dog has green or yellow discharge and you have multiple pets, keep the affected dog separated and wash your hands after handling them. Allergies and dry eye are not contagious.

Quick Answer

Clear, watery discharge is usually allergies or irritation and is often normal. Yellow or green discharge indicates a bacterial infection needing vet-prescribed antibiotic drops. Brown staining is cosmetic tear stains. See your vet if the discharge is colored, your dog is squinting or has red eyes, or if there is swelling or vision changes.

Eye Discharge Color Guide
Causes by Discharge Color
Home Care & Cleaning
When to See a Vet
Veterinary Treatment
Breeds at Higher Risk
FAQ

Eye Discharge Color Guide

The color and consistency of eye discharge is the most reliable indicator of what is causing it. Use this chart as a quick reference:

Color	Likely Cause	Urgency	Action
Clear, watery	Allergies, wind, irritation, dust	Low	Monitor; clean gently
White or gray	Dry eye (KCS), conjunctivitis	Moderate	See vet within 48 hours
Yellow or green	Bacterial infection, corneal ulcer	High	See vet within 24 hours
Brown or reddish	Tear stains (porphyrins), epiphora	Low	Cosmetic; clean daily
Bloody	Trauma, foreign body, serious eye disease	Emergency	See vet immediately

Causes by Discharge Color

Clear, Watery Discharge

Usually the least concerning type. Common causes include seasonal or environmental allergies (pollen, dust, mold), wind or drafts irritating the eyes, minor foreign body irritation (grass seed, dust), and breed-related epiphora (tear overflow in flat-faced breeds).

When it's a problem: Persistent watery eyes from one eye only can indicate a blocked tear duct or a developing infection. If the tearing is excessive or sudden, check for a foreign body.

White or Gray Discharge

Dry eye (keratoconjunctivitis sicca, or KCS) is the most common cause of thick white or grayish discharge. The tear glands produce insufficient tears, so the eyes compensate with a thick mucoid discharge. Without treatment, dry eye causes corneal scarring and vision loss.

Breeds at risk: Cocker Spaniels, Bulldogs, Pugs, West Highland White Terriers, Cavalier King Charles Spaniels, and Lhasa Apsos.

Yellow or Green Discharge

This is the color that should prompt a vet visit. Yellow or green discharge strongly suggests a bacterial infection. The color comes from white blood cells (pus) fighting bacteria. Common causes include bacterial conjunctivitis, corneal ulcers, and secondary infection from untreated dry eye or allergies.

Treatment requires antibiotic eye drops prescribed by your vet. Do not use leftover antibiotics or human eye drops.

Brown or Reddish-Brown Staining

Tear stains are caused by porphyrins, iron-containing compounds in tears that oxidize and stain light-colored fur. This is primarily a cosmetic issue, not a medical one. However, excessive tearing should be investigated for underlying causes like blocked tear ducts, entropion (inward-rolling eyelids), or chronic irritation.

Common in: Poodles, Maltese, Shih Tzus, Bichon Frises, and other white or light-coated breeds.

Bloody Discharge

Blood in or around the eye is always concerning. Possible causes include trauma (scratch, puncture, blunt injury), foreign body lodged in the eye, cherry eye (prolapsed third eyelid gland), blood clotting disorders, or rarely, intraocular tumors. Seek veterinary care immediately.

Dog on grooming table having face and eyes carefully cleaned

Regular gentle cleaning of the eye area can prevent buildup and catch changes early

Home Care & Cleaning

For mild, clear discharge or cosmetic tear stains, these home care steps can help keep your dog's eyes clean and comfortable:

Gentle wipe with a damp cloth

Use a clean, soft, damp cloth or pet-safe eye wipe to gently clean from the inner corner of the eye outward. Use a separate cloth for each eye to prevent spreading any infection between eyes.

Saline rinse for irritants

If you suspect dust, pollen, or a mild irritant, flush the eye with a sterile saline eye wash made for pets. Tilt your dog's head slightly and gently squeeze the solution to flush from inner to outer corner.

Keep the area dry and clean

Moisture trapped in fur around the eyes promotes bacterial growth and worsens tear stains. After cleaning, gently pat the area dry. For long-haired breeds, trim the fur around the eyes carefully or have your groomer do it.

Do NOT Use These on Your Dog's Eyes

Never use human eye drops (Visine, Clear Eyes) without vet approval — some contain tetrahydrozoline, which is toxic to dogs. Do not use hydrogen peroxide, alcohol, or essential oils near the eyes. Avoid products with bleaching agents marketed for tear stain removal, as they can irritate the eyes and damage skin.

Products for Dog Eye Discharge

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Angel's Eyes Gentle Tear Stain Wipes

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Vetericyn Plus Eye Wash for Pets

Sterile eye wash for irritation, abrasions, and discharge. Non-stinging formula safe for all animals.

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As an Amazon Associate, OurPetGroomer earns from qualifying purchases. Product prices are approximate and may change. We only recommend products we believe will benefit your pet.

When to See a Vet

Eye problems can escalate quickly and may lead to permanent vision loss if untreated. See your vet if you notice:

See Your Vet If:

1. Green or yellow discharge — bacterial infection likely
2. Pain, squinting, or pawing at the eye
3. Swelling of the eyelid or tissue around the eye
4. Vision changes — bumping into things, difficulty tracking objects
5. Cloudy or blue cornea — may indicate glaucoma or edema
6. Pupils different sizes (anisocoria) — neurological concern
7. Discharge persists more than 48 hours despite home care
8. Bloody discharge or visible trauma to the eye

Veterinary Treatment

Your vet will perform an ophthalmic exam including a fluorescein stain test (to check for corneal ulcers), Schirmer tear test (to measure tear production), and intraocular pressure measurement (to check for glaucoma).

Condition	Treatment	Typical Cost
Bacterial conjunctivitis	Antibiotic eye drops or ointment (7-14 days)	$100 - $250
Dry eye (KCS)	Cyclosporine or tacrolimus eye drops (lifelong), artificial tears	$200 - $400 initial
Corneal ulcer	Antibiotic drops, pain medication, e-collar, possible surgery	$300 - $1,500
Allergic conjunctivitis	Antihistamines, anti-inflammatory eye drops, allergen avoidance	$100 - $300
Blocked tear duct	Flushing under sedation, or surgical correction	$200 - $800
Glaucoma	Pressure-lowering eye drops, possible surgery, pain management	$500 - $3,000

Breeds at Higher Risk

Certain breeds are genetically predisposed to eye discharge and related conditions due to their facial structure, eye anatomy, or coat type:

Brachycephalic breeds (Bulldogs, Pugs, Shih Tzus, Pekingese) — Shallow eye sockets and protruding eyes lead to excessive tearing, exposure keratitis, and higher infection risk.
White-coated breeds (Poodles, Maltese, Bichon Frise) — More visible tear staining due to light fur, often combined with shallow tear drainage anatomy.
Cocker Spaniels — Highest risk breed for dry eye (KCS), which causes chronic thick white discharge.
Basset Hounds and Bloodhounds — Droopy eyelids (ectropion) trap debris and moisture, promoting infection.
Shar-Peis — Excessive skin folds around the eyes cause entropion (inward-rolling lids) that irritate the cornea.

Frequently Asked Questions

What does the color of my dog's eye discharge mean?+

Clear watery discharge is usually allergies or irritation. White or gray suggests dry eye. Yellow or green indicates bacterial infection and needs vet care. Brown staining is cosmetic tear stains from porphyrins. Bloody discharge signals trauma or serious eye disease and needs immediate vet attention.

When should I take my dog to the vet for eye discharge?+

See your vet if the discharge is yellow, green, or bloody, if your dog is squinting or pawing at the eye, if there is swelling or vision changes, if one pupil is a different size, or if discharge persists more than 48 hours despite home care.

How can I clean my dog's eye discharge at home?+

Use a clean damp cloth or pet-safe eye wipe, wiping from inner corner outward. Use a separate cloth for each eye. For crusty buildup, dampen it first. Sterile saline eye wash can flush mild irritants. Never use human eye drops like Visine without vet approval.

Why does my dog have brown tear stains?+

Brown tear stains are caused by porphyrins, iron compounds in tears that oxidize and stain light fur. This is common in white and light-colored breeds and flat-faced breeds. It's usually cosmetic, but persistent excessive tearing should be checked for blocked tear ducts or eye irritation.

Can dog eye discharge be contagious?+

Some causes are contagious between dogs, including bacterial conjunctivitis, canine distemper, and viral infections. If your dog has colored discharge, keep them separated from other pets and wash your hands after handling them. Allergies and dry eye are not contagious.

Red Eyes in Dogs

Causes of bloodshot or red eyes, from allergies to glaucoma.

Dog Eye Infections

Bacterial, viral, and fungal eye infections — signs and treatment.

Keep Your Dog's Eyes Healthy

Professional groomers routinely check and clean around the eye area. Regular grooming helps prevent tear stain buildup, catches eye discharge changes early, and keeps facial hair trimmed away from the eyes.

Find a Groomer Near You