Why does my dog have watery eyes?
Watery eyes in dogs are often nothing more than irritation from wind, dust or pollen, and clear up on their own. They can also point to something that needs a proper look, from a blocked tear duct to an eye infection, so it is worth paying attention to how long it lasts and whether anything else changes alongside it.
Usually not urgent
This is common and often manageable at home — but see a vet if it persists, gets worse, or comes with other changes.
The more common, less worrying causes
Wind, dust, pollen and general environmental irritation are among the most common reasons for a dog's eyes to water, particularly after a walk in blustery conditions or through long grass. This kind of watering is usually temporary and settles once the irritant is gone, without redness, discharge or any sign your dog is bothered by it.
Some breeds, particularly those with prominent eyes or flatter faces, and small breeds like Poodles and Bichons, are more prone to a persistent tear overflow that causes staining around the eyes even without anything actively wrong. This is a structural tendency in some dogs rather than an illness, though it is still worth mentioning to your vet if it is new or worsening.
Causes that need a proper look
A blocked or narrowed tear duct stops tears draining normally, so they overflow down the face instead, and this can develop gradually or come on more suddenly depending on the cause. Conjunctivitis — inflammation of the tissue around the eye, which can be caused by infection, allergy or irritation — often causes watering alongside redness and sometimes a coloured discharge.
An eyelid that rolls inward, called entropion, causes the eyelashes to rub against the eye's surface, leading to persistent irritation and watering that will not resolve on its own without treatment. A scratched or ulcerated cornea is more painful and usually comes with squinting or pawing at the eye rather than simple watering, and needs urgent attention.
Signs that mean a vet visit
See your vet if the watering is accompanied by redness, swelling, squinting, pawing at the eye, a change in the colour or thickness of any discharge, cloudiness, or if it is affecting one eye rather than both without an obvious reason like a scratch. Sudden onset, or watering that gets worse rather than better over a few days, is also worth having checked.
A dog who seems to be in pain — holding an eye closed, rubbing their face on furniture or the floor, or reluctant to be touched near the eye — needs to be seen promptly rather than waiting, since some causes of eye pain can worsen quickly if left.
Why one eye watering matters more than both
General environmental irritation, like wind or pollen, tends to affect both eyes roughly equally, since your dog has been exposed to the same conditions on each side. When only one eye is watering and the other looks completely normal, that points more strongly toward something localised — a scratch, an eyelash growing in the wrong place, a foreign body caught under the eyelid, or an infection that has taken hold on one side only.
This is not a hard rule, since some structural causes and some infections can still affect one eye first before the other follows, but a clear difference between your dog's two eyes is a useful piece of information to mention to your vet rather than something to work out yourself. It often points them toward the more likely causes faster than a general description alone.
What helps day to day
Gently wiping away tear staining with a damp cloth or a product designed for the job keeps the area clean and comfortable, particularly in breeds prone to persistent tearing, but it does not address an underlying cause if one exists.
If your dog's eyes water mainly after walks in windy or dusty conditions and settle quickly afterwards with no other signs, that pattern on its own is rarely something to worry about. It is a change in that pattern — more frequent, more persistent, or joined by other symptoms — that is the signal to get it looked at.
What can help
Things we stock that owners commonly use alongside a vet’s advice — not a substitute for it.
Leucillin Antiseptic Skincare Spray for Cats & Dogs
A versatile, alcohol-free antiseptic spray that cleans, soothes, and helps protect your pet's skin from bacteria, viruses, and fungi.
From£16.49
Absorbent Cotton Gauze Swabs for Pets – Pack of 100
Highly absorbent, low-lint cotton gauze swabs produced in clean conditions — a practical first-aid essential available in three size and ply combinations.
From£4.49
MPS Medical PetS Boot – Waterproof Paw Protector
A vet-recommended waterproof boot that keeps bandages, dressings, and casts dry during walks and wet weather.
£30.49
Common questions
- Is it normal for a dog's eyes to water after a walk?
- Yes, wind, dust and pollen commonly cause temporary watering that settles once your dog is back indoors and away from the irritant. This is different from ongoing or worsening watering, which is more likely to point to something that needs a vet's attention.
- What is tear staining and is it a health problem?
- Tear staining is the reddish-brown marking that can build up under a dog's eyes from persistent tear overflow, common in certain breeds. It is often more of a cosmetic issue than a health one, but it is still worth mentioning to your vet, since it can occasionally point to a treatable underlying cause.
- Can allergies cause a dog's eyes to water?
- Yes, environmental or food allergies can cause eye irritation and watering, sometimes alongside other signs like itchy skin or ear problems. If you suspect allergies are behind it, your vet can help work out what your dog is reacting to and how to manage it.
- My dog is pawing at one watery eye — is that urgent?
- Yes, pawing at an eye, especially just one, is a sign of discomfort or pain and is worth getting seen promptly rather than waiting to see if it settles. It can point to something like a scratch, a foreign body, or an infection that benefits from being treated early.
Related
Sources
Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.