Tear stains: what you can clean, and what needs a vet

What a tear stain actually is

The reddish-brown mark under a pet’s eyes is pigment left behind by tears sitting on the fur. It shows most on white and light coats, which is why it looks like a breed problem — it is really a visibility problem.

Cleaning the fur addresses the stain. It does not address why the eye is watering, and those are two genuinely different questions.

What you can safely do at home

• Soften dried debris first with a clean, damp cloth — never pick at it dry.
• Work outward, away from the eye, with very light pressure.
• Use a small brush made for facial fur; a full-size grooming brush is too coarse and too large to control near an eye.
• Clean and fully dry your tools after every session.
• Keep the fur around the eye trimmed short if it is long enough to wick tears onto the face.

What not to do

Never put a brush, comb or trimmer blade into the eye itself, and never use a product near the eye that is not explicitly labelled as safe for that use. Several popular home remedies circulated online — including hydrogen peroxide and some whitening products — can cause serious damage to the eye.

Do not use a tear-stain product that contains an antibiotic unless a veterinarian has prescribed it. Some imported products contain tylosin without declaring it.

The signs that mean stop and book a vet

• Sudden onset of tearing in a pet that never had it before.
• Redness or swelling of the eye or eyelid.
• Thick, coloured or smelly discharge, as opposed to clear tears.
• Squinting, pawing at the face, or any sign of pain.
• Staining on one side only — this often points to a blocked tear duct or a foreign body.

Why it matters that this is a grooming tool

A grooming brush cleans fur. It does not diagnose or treat anything. Persistent tearing can be caused by blocked tear ducts, eyelid or lash abnormalities, allergies, or infection — none of which improve with better brushing.

If the staining keeps coming back after you clean it, that is information worth taking to a vet, not a reason to clean harder.