Vet Guide to Conjunctivitis in Dogs (Pink Eye) 2025 🐶👁️
By Dr. Duncan Houston BVSc
Conjunctivitis, commonly known as “pink eye,” is inflammation of the conjunctiva—the membranes lining the eyelids and covering the eye. It causes redness, swelling, discharge, itching, pain, and squinting. In dogs, it may stem from allergies, infections, trauma, environmental irritants, immune issues, breed-related anatomy abnormalities, or secondary to other eye diseases.
⚠️ Key Causes
- Allergic (seasonal/pollen, dust)—common with clear/white discharge.
- Bacterial: e.g., Staph; viral: e.g., distemper—often yellow/green discharge.
- Trauma, foreign bodies, eyelid issues (entropion, ectropion, distichiasis).
- Immune conditions, dry eye (KCS), tumors, and blocked tear ducts.
👀 Recognizing the Signs
- Red or swollen conjunctivae
- Clear, yellow, or green mucus/pus discharge
- Squinting, blinking, rubbing eyes or face
- Possible nose discharge, coughing, itching, lethargy.
🔬 Diagnosis by Your Vet
- Full ophthalmic exam including eyelids, eyelashes, tear ducts, and third eyelid.
- Schirmer tear test and fluorescein stain for corneal ulcers.
- Intraocular pressure check to rule out glaucoma or uveitis.
- Optional tests: cultures, PCR, biopsy, allergy screening.
💊 Treatment Options
- Topical antibiotics for bacterial cases (drops/ointments).
- Topical/oral steroids or antihistamines for allergic/inflammatory cases.
- Antivirals or immune modulation for viral or immune-mediated forms.
- Surgical correction for eyelid or tear duct defects; tear stimulants for KCS.
- Supportive: sterile saline washes, protective e-collar, cold compresses, and artificial tears at home.
📈 Prognosis & Recovery
- Most cases resolve fully with treatment; underlying causes influence recurrence.
- Untreated conjunctivitis may lead to corneal ulcers, scarring, or vision loss.
- Breeds prone (bulldogs, cocker spaniels, schnauzers) may need early vet care.
✅ Dr Houston's Vet Tips
- 🗓 Seek vet care early; don’t rely on human eye drops.
- 🧼 Use saline flushes and e-collars to prevent worsening.
- 🕵️ Investigate underlying causes—don’t just treat symptoms.
- 🔄 Schedule rechecks to monitor healing and prevent complications.
If your dog shows red, watery, or discharging eyes—especially with squinting or rubbing—consult via AskAVet.com now. Track medication, symptoms. 🐾❤️
This article is general veterinary education and does not diagnose or treat an individual animal. Always confirm medication names, doses and interactions with the veterinarian who knows your pet.
If your animal is struggling to breathe, collapsed, bleeding heavily, seizing, or has eaten something toxic, contact your vet or the nearest emergency clinic now.
Animal Poisons Helpline (AU) 1300 869 738 · Animal Poisons Helpline (NZ) 0800 869 738 · ASPCA Animal Poison Control (US) (888) 426-4435
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Ask A Vet articles are written by Dr Duncan Houston BVSc, a practising veterinarian, unless another author is named in the byline.
