Why Is Your Dog’s Eye Watering? Causes, Symptoms, and When to Get Help

Noticing your dog’s eye watering more than usual can be a little unsettling, especially when you’re not sure whether it’s something minor or a sign of a bigger problem. The good news is that watery eyes in dogs are incredibly common and are often caused by something straightforward and treatable. This guide will walk you through everything you need to know, from the most likely causes to when it’s time to pick up the phone and call your vet.

Common Causes

Watery eyes, known medically as epiphora, occur when tears overflow from the eye rather than draining normally through the tear ducts. This can happen for a wide variety of reasons, ranging from mild environmental irritants to underlying health conditions that need professional attention.

One of the most frequent culprits is environmental irritation. Just like people, dogs can react to dust, smoke, pollen, and other airborne particles that cause the eyes to produce extra tears as a protective response. Seasonal allergies are also a surprisingly common cause of eye watering in dogs, often appearing alongside other symptoms like itchy skin or a runny nose. You may notice that your dog’s eyes are worse in spring and fall when pollen counts are highest, or during dry winter months when indoor heating circulates more dust and particulates. Allergic eye conditions are typically diagnosed through a combination of clinical history, elimination of other causes, and sometimes allergy testing performed by a veterinary dermatologist.

Blocked or narrow tear ducts are another common reason your dog’s eyes may appear watery. When tears can’t drain properly, they spill over the lower eyelid and run down the face, which is especially visible in light-colored dogs as reddish-brown staining. Vets diagnose blocked tear ducts using a simple dye test called the Jones fluorescein test, where a small amount of fluorescent dye is placed in the eye to see whether it passes through the nasolacrimal duct into the nose as it should. When it doesn’t, a blockage or anatomical abnormality is usually the cause.

Age also plays a role worth mentioning. Puppies can sometimes have congenitally malformed tear ducts that only become obvious once they start producing adult-volume tears. Older dogs, on the other hand, are more susceptible to developing dry eye syndrome, known as keratoconjunctivitis sicca, where the eye paradoxically compensates for reduced tear production by producing a watery, mucousy discharge. A quick Schirmer tear test at your vet’s office measures tear production in seconds and can confirm or rule this out.

Here are some of the most common causes of dog eye watering to be aware of:

• Environmental allergens or irritants such as pollen, dust, mold, or cigarette smoke
• Blocked or malformed tear ducts that prevent proper tear drainage
• Eye infections caused by bacteria or viruses, often accompanied by discharge
• Corneal scratches or ulcers from playing in tall grass, roughhousing, or debris
• Entropion or eyelid abnormalities where the eyelid rolls inward, causing the lashes to irritate the surface of the eye
• Dry eye syndrome (KCS) where insufficient tear production triggers compensatory watery or mucousy discharge
• Glaucoma in its early stages, which can present with subtle tearing before more serious symptoms develop

In some cases, a foreign object lodged near the eye, such as a grass seed or small piece of debris, can also cause sudden and persistent watering. If your dog’s eye watering came on suddenly and they seem uncomfortable, this is always worth investigating promptly.

Symptoms to Watch For

Watery eyes alone aren’t always cause for immediate alarm, but the symptoms that accompany the tearing can tell you a great deal about what’s going on. Paying close attention to the full picture will help you make a more informed decision about whether your dog needs to be seen by a vet.

Keep an eye out for the following symptoms alongside watering:

• Thick, yellow, or green discharge coming from the eye, which may suggest an infection
• Redness or visible inflammation of the whites of the eye or the surrounding tissue
• Squinting, blinking excessively, or keeping the eye partially closed, all of which indicate discomfort or pain
• Pawing at the eye or rubbing the face on furniture or carpet
• Cloudiness or a bluish tint to the eye, which can be a sign of corneal damage or more serious conditions
• Visible tear staining on the fur beneath the eye, particularly in lighter-colored breeds
• Swelling around the eye or on the eyelid itself

The more of these symptoms your dog is showing, the more urgently they may need to be evaluated. A single watery eye is often more concerning than both eyes watering equally, as it may point to a localized issue such as a scratch, blockage, or foreign body.

Symptom Severity at a Glance

Symptom	Risk Level	Action Required
Clear, watery discharge from both eyes, no discomfort	Mild	Monitor at home for 24–48 hours
Visible tear staining on fur, no other symptoms	Mild	Schedule a routine vet visit
Redness or mild swelling around the eye	Moderate	Call your vet within 24 hours
Yellow or green discharge, possible infection	Moderate	Call your vet within 24 hours
Squinting, pawing at eye, or keeping eye closed	Moderate to Serious	Call your vet today
Cloudiness, bluish tint, or visible structural change	Serious	Seek veterinary care urgently
Sudden swelling, bulging eye, or suspected trauma	Serious	Seek emergency care immediately

Breeds Most at Risk

While any dog can develop watery eyes, certain breeds face a significantly higher baseline risk due to their anatomy and genetics.

Brachycephalic breeds — including Bulldogs, Pugs, Shih Tzus, and Boxers — are among the most commonly affected. Their flattened facial structure means their eyes are more prominent and exposed, their tear ducts are often compressed or malformed, and their eyelid anatomy frequently predisposes them to conditions like entropion and lagophthalmos, where the eyelids can’t fully close. Owners of these breeds should expect to monitor eye health as a routine part of care and should establish a relationship with a vet experienced in brachycephalic conditions.

Cocker Spaniels have a well-documented predisposition to blocked tear ducts and chronic eye infections, partly due to their deep-set eyes and the excess skin folds around their face. They are also more prone to developing cherry eye and dry eye syndrome compared to many other breeds, making regular eye exams especially important.

Poodles and Maltese — and their popular mixed-breed offspring like Cockapoos and Maltipoos — tend to experience prominent epiphora due to their fine, light-colored coats making tear staining highly visible, combined with a genetic tendency toward narrower tear duct openings. In these breeds, tear staining is often cosmetic rather than medically serious, but it’s always worth ruling out an underlying cause with your vet before assuming that’s the case.

What You Can Do at Home

If your dog’s eyes are mildly watery and they don’t appear to be in any distress, there are a few gentle steps you can take at home while monitoring the situation. Always wash your hands before and after touching your dog’s eyes to avoid introducing additional bacteria.

Using a soft, clean cloth dampened with warm water, you can gently wipe away any discharge or crust that has accumulated around the eye. Be careful to wipe away from the eye rather than across it, and use a fresh section of cloth for each wipe. Never use cotton balls near the eyes, as the fibers can break off and cause further irritation.

If your dog has long hair around their face, keeping it trimmed back from their eyes can make a meaningful difference in reducing irritation. Similarly, if you’ve recently changed household cleaning products or introduced a new air freshener, consider whether environmental changes could be contributing to the problem.

It’s worth noting that you should never use human eye drops on your dog without veterinary guidance. Many over-the-counter products contain ingredients that are not safe for dogs, and using the wrong product could potentially make things worse.

When to See a Vet

While mild eye watering can sometimes resolve on its own with gentle care, there are certain situations where waiting is not the right call. Your dog’s eyesight is precious, and eye conditions can deteriorate quickly if left untreated.

Schedule a vet visit promptly if you notice any of the following:

• The eye watering has persisted for more than 24 to 48 hours without improvement
• Your dog is clearly uncomfortable, squinting, or pawing at their eye
• There is colored discharge, redness, or visible swelling
• The eye appears cloudy, hazy, or structurally different than normal
• You suspect a foreign object may be lodged in or around the eye
• Your dog has recently had an injury to the face or eye area

Eye infections, corneal ulcers, and glaucoma are all conditions that can look like simple watery eyes in the early stages but require prompt treatment to prevent lasting damage. When in doubt, it is always better to have your dog evaluated sooner rather than later.

How Pet Insurance Can Help

Veterinary eye exams, prescription eye drops, and specialist referrals can add up quickly, especially if your dog develops a chronic condition or requires ongoing management. Having a solid pet insurance plan in place means you can focus on getting your dog the care they need without the added stress of unexpected costs.

Protective Care: Get a free pet insurance quote and protect your dog today

For times when you need immediate guidance from a licensed veterinarian without leaving home, telehealth services can be a lifesaver.

For more clinical details on canine health, you can refer to the professional guidelines from the Merck Veterinary Manual.

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Your dog depends on you to notice when something isn’t quite right, and the fact that you’re looking into this already says a great deal about the care you provide. Most cases of eye watering in dogs are very manageable once the cause is identified, and with the right support, your pup will be back to their bright-eyed, happy self in no time. Don’t hesitate to reach out to your veterinarian whenever you have concerns — that’s exactly what they’re there for.