By the Dog Health Insider Editorial Team · Updated June 5, 2026
From sudden eye boogers to reddish tear stains, a dog’s eyes can tell you a lot. Here is how to tell normal discharge from a problem and keep the eye area clean.
Decoding eye discharge
A little clear or grey discharge is normal; sudden, heavy, colored or smelly discharge, or squinting, is not.
Allergies vs. infection
Allergies cause clear, watery, itchy eyes (often both eyes); infections tend to be thicker, colored and may affect one eye.
Gently cleanse around the eyes and help reduce tear-stain buildup.
Tear stains
Reddish-brown stains come from porphyrins in tears; daily wiping and keeping the area dry help reduce buildup.
When to see your vet
Squinting, pawing, cloudiness, a visibly painful or swollen eye, or green discharge are urgent — eye issues can worsen fast.
Frequently asked questions
Why does my dog suddenly have eye boogers?
Often a passing irritant or allergy; if it is thick, colored, or with redness and squinting, see your vet.
How do I clean my dog’s eyes?
Wipe gently from the inner corner outward with a dog-safe rinse or damp pad; never touch the eyeball.
How do I get rid of tear stains?
Keep the area clean and dry daily; persistent staining can have underlying causes worth a vet check.
⚕ Disclaimer: This article is for educational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. Supplements are not medicines and are not intended to diagnose, treat, cure, or prevent any disease. Always consult your veterinarian before starting any new supplement, especially if your dog is pregnant, nursing, on medication, or has a health condition.
Sources
- Merck Veterinary Manual. Eye Disorders of Dogs.
- American College of Veterinary Ophthalmologists (ACVO).
- American Kennel Club. Dog Eye Discharge. akc.org