Tear Stains in Small Dogs: Causes & Care
That rust-colored streak under your dog’s eyes isn’t dirt, and it’s usually not an infection either. It’s a normal pigment in tears that becomes visible once it’s had time to sit on light fur — but the reason it’s there in the first place is worth understanding, especially if it shows up suddenly.
Tear staining itself is caused by porphyrin — an iron-containing pigment naturally present in tears. The color is cosmetic. What actually matters is why the tears are overflowing onto the face in the first place, since that ranges from harmless breed anatomy to something a vet needs to look at.
Why It Happens: Epiphora
The medical term for excess tearing is epiphora, and VCA Animal Hospitals describes it as a symptom rather than a specific disease — tears normally drain through small ducts near the inner corner of the eye into the nose, and epiphora happens when that drainage isn’t keeping up, either because too many tears are being produced or the drainage itself isn’t working properly.
Once tears spill onto the face instead of draining internally, the porphyrin in them oxidizes on contact with air and light fur, producing the reddish-brown color. It’s most visible on white or pale coats — Bichon Frises, Maltese, and white or cream Poodles are frequently affected — not because those breeds produce more porphyrin, but because the staining simply shows up more on that coat color.
Common Causes in Small Breeds
Chronic, symmetrical staining that’s been slowly present for a long time is usually low-concern. Staining that appears suddenly, worsens quickly, shows up on only one side, or comes with squinting, redness, or unusual discharge is a different pattern — that combination is worth a vet visit rather than a home remedy.
Safe Daily Care
Coconut oil, apple cider vinegar, and hydrogen peroxide are commonly recommended in home-remedy lists, but a VCA veterinarian has specifically flagged these as unsafe to use near a dog’s eyes. Stick to plain warm water or a product formulated and labeled specifically for use around the eyes.
When Tear-Stain Removers Actually Help — and When They Don’t
Topical wipes and cleansers can help manage the surface staining and reduce the yeast component, but they don’t address an anatomical cause like a blocked duct or an eyelid abnormality. Some oral supplements are marketed to reduce porphyrin levels in tears, but the evidence behind them is limited, and they won’t correct a structural drainage problem either way. If staining is bothering you cosmetically but the eye itself is healthy on exam, that’s a reasonable time to discuss options with your vet rather than trying product after product.
Frequently Asked Questions
Is tear staining a sign my dog is sick?
Not usually. Most tear staining is a harmless, cosmetic result of normal anatomy in certain breeds. It becomes more concerning if it appears suddenly, worsens quickly, affects only one eye, or comes with redness, squinting, or discharge.
Does diet cause tear stains?
The evidence here is limited. Some products marketed for tear staining claim dietary or water-quality effects, but there isn’t strong evidence that switching food or water alone resolves staining caused by anatomy or a blocked duct.
Can I use apple cider vinegar or coconut oil to clean the stains?
It’s best to avoid both near the eyes — a VCA veterinarian has specifically noted these aren’t safe for that use. Plain warm water or a product made for use around the eyes is the safer choice.
Can tear staining be fixed permanently?
It depends on the cause. If it’s tied to a fixable issue like an ingrown eyelash or a mild infection, treating that can resolve it. If it’s due to breed anatomy like a naturally narrow tear duct, ongoing gentle care manages the appearance rather than eliminating it entirely — though in some persistent cases, a vet may discuss surgical options.
The Bottom Line
Tear staining itself is just a pigment sitting on fur — the real question is always what’s causing the tears to spill over in the first place. Chronic, symmetrical staining in a breed prone to it is usually nothing more than cosmetic upkeep. A sudden change, one-sided staining, or any sign of eye discomfort is the pattern that actually warrants a trip to the vet.
This article is for informational purposes only and isn’t a substitute for veterinary diagnosis or treatment. Sudden, worsening, or one-sided tear staining, or any signs of eye pain or discharge, should be evaluated by a veterinarian.