Dog Watery Eyes: Causes, Treatment, and When to See a Vet

Watery eyes in dogs are extremely common, but they're not always harmless. Sometimes those wet, tear-stained cheeks point to something simple like an irritation; other times they signal a problem that needs prompt vet attention. Understanding the most likely dog watery eyes causes helps you decide what to do next.

What Are Watery Eyes (Epiphora)?

The medical term is epiphora — the overflow of tears down the face. The most common signs include dampness beneath the eyes, reddish-brown staining, odor, skin irritation, and sometimes skin infection where the fur stays wet (AAHA Canine Life Stage Guidelines, 2019).

There are two basic reasons a dog's eyes water more than they should: something is irritating the eye and making it produce too many tears, or tears are produced normally but can't drain properly through the nasolacrimal duct.

Common Causes

Eye Irritation

• Allergies — pollen, dust, mold, and household irritants are top culprits
• Conjunctivitis — viral or bacterial infection of the membrane around the eye
• Foreign bodies — grass seeds, dust, or eyelashes rubbing on the cornea
• Corneal ulcers — painful scratches that cause heavy tearing and squinting
• Eyelid abnormalities like entropion (rolled-in eyelid) or distichiasis (extra eyelashes)
• Glaucoma — increased pressure inside the eye, a medical emergency

Drainage Problems

• Blocked or undeveloped tear ducts — congenital in some breeds, especially Cocker Spaniels and Poodles
• Facial structure — flat-faced (brachycephalic) breeds like Pugs, Bulldogs, and Shih Tzus often have shallow eye sockets that don't drain tears well

Breed-Specific Tendencies

Some breeds are simply built to tear more than others. Brachycephalic breeds (Pugs, Bulldogs, Boxers, Boston Terriers) have eyes that bulge slightly forward, which pushes tears outward instead of down the drainage system. Long-haired breeds like Maltese, Bichon Frises, and Shih Tzus often develop reddish-brown tear staining from constant moisture and porphyrin pigment in the tears.

When to Worry

Most chronic watery eyes are an annoyance rather than an emergency. But contact your vet promptly if your dog has:

• Sudden, severe tearing in one eye, especially with squinting or pawing
• Cloudy or bluish cornea
• Yellow or green pus-like discharge (suggests infection, not just tears)
• Redness, swelling, or visible third eyelid covering part of the eye
• Unequal pupil sizes or visible damage to the eye surface
• Vision changes — bumping into furniture, hesitation on stairs
• Eye held partially or completely closed

Any sudden, painful eye should be seen the same day — corneal ulcers and glaucoma can worsen quickly.

What To Do at Home

Wipe gently and often. Use a soft, damp cloth or a vet-approved eye wipe to remove discharge twice daily. Keeping the fur around the eyes clean and dry prevents skin infection.

Trim long fur. Hair brushing the cornea is a common, fixable cause of tearing. A groomer can carefully trim around the eyes.

Identify allergies. If watery eyes come and go with the seasons, allergies are likely. Talk to your vet about safe antihistamines or allergy testing.

Avoid irritants. Smoke, harsh cleaners, and dusty environments can trigger or worsen tearing.

Don't use human eye drops. Some are safe; many are not. Ask your vet before putting anything in your dog's eye.

Stay on top of preventive care. Annual eye exams catch many problems before they become urgent.

Frequently Asked Questions

What causes watery eyes in dogs? Watery eyes (epiphora) happen for two basic reasons: something irritates the eye and it makes too many tears, or tears are made normally but can't drain through the tear duct. Irritation causes include allergies, conjunctivitis, foreign bodies, corneal ulcers, eyelid abnormalities (entropion, extra lashes), and glaucoma. Drainage causes include blocked or undeveloped tear ducts and flat-faced anatomy.

Why does my dog have reddish-brown tear stains? The reddish-brown staining under the eyes comes from porphyrin, a pigment in tears, plus constant moisture keeping the fur wet. It's especially common in long-haired breeds like Maltese, Bichon Frises, and Shih Tzus, and in flat-faced breeds whose slightly bulging eyes push tears outward instead of down the drainage system.

When should I worry about my dog's watery eyes? Most chronic watery eyes are an annoyance, not an emergency. But contact your vet promptly for sudden severe tearing in one eye (especially with squinting or pawing), a cloudy or bluish cornea, yellow or green pus-like discharge, redness or swelling, unequal pupils or visible eye damage, vision changes, or an eye held closed. Any sudden, painful eye should be seen the same day.

What can I do at home for my dog's watery eyes? Wipe gently and often with a damp cloth or vet-approved eye wipe (twice daily) to keep the fur clean and dry, have a groomer trim long fur that brushes the cornea, avoid irritants like smoke and dusty environments, and talk to your vet about allergies if the tearing is seasonal. Don't use human eye drops without asking your vet first.

Are watery eyes worse in certain breeds? Yes. Flat-faced (brachycephalic) breeds like Pugs, Bulldogs, Boxers, and Boston Terriers have eyes that bulge slightly forward and drain tears poorly, and breeds like Cocker Spaniels and Poodles can have blocked or undeveloped tear ducts. Long-haired breeds develop tear staining from constant moisture.

Still Not Sure if Your Dog Needs a Vet?

When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of your dog's eye — pupil size, discharge color, and the surrounding fur, or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.

Start a triage →