Can canine conjunctivitis spread to other pets?

Some forms of conjunctivitis caused by infectious agents can spread to other animals. It is recommended to isolate the affected pet and consult your vet about whether testing or treatment for other animals is needed.

How long does it take for conjunctivitis to improve?

Recovery time depends on the underlying cause. Mild irritation or allergic conjunctivitis may improve within a few days, while infectious or chronic forms can take several weeks or longer. Follow your vet's instructions and attend all scheduled follow-ups.

Can I clean eye discharge at home with plain water?

You can gently wipe away surface discharge with clean water or sterile saline in the short term, but avoid applying any medication on your own or rubbing the eye repeatedly. Consult your vet if unsure.

What tests are needed to confirm the cause of conjunctivitis?

A full ophthalmic physical exam and cytology of the discharge are the most common starting points. Culture or PCR testing may be added when needed; your vet will determine the appropriate tests based on your dog's presentation.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Conjunctivitis in Dogs: Symptoms, Eye Exam & Care Guide [2025]

Canine conjunctivitis can be caused by allergies, dry eye, or infection; targeted treatment based on the underlying cause typically yields good results with eye drops

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: AVMA, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Eye is completely closed with persistent and obvious pain
•Eye has heavy purulent discharge with foul odor
•Sudden vision loss or frequent bumping into furniture repeatedly

Schedule a clinic visit soon (within 24–72 hours)

•One or both eyes are red and swollen with increased tearing
•Frequent blinking or persistent pawing/rubbing at the eye
•Discharge has changed color or significantly increased in amount

01What Symptoms Signal a Problem?

Common signs of conjunctivitis include eye redness, excessive tearing, and various types of discharge, often accompanied by discomfort or rubbing behaviour.

Clear, yellow, or purulent (pus-like) eye discharge
Frequent blinking or pawing/rubbing at the eye
Visible redness or bloodshot appearance in the whites of the eye or conjunctiva
Increased tearing in one or both eyes
Flinching or signs of pain when the eye is touched

Seek emergency care immediately if you notice the following symptoms:

⚠️ If symptoms persist or worsen, seek veterinary evaluation promptly

02How to Assess Your Dog at Home: Key Observations and When to Go to Emergency

Observing and documenting changes at home helps your vet assess the progression and likely cause of the condition.

Note any changes in alertness, appetite, or activity level
Monitor water intake and bowel/bladder habits for any changes
Weigh your dog daily and watch for unexpected weight changes
Take close-up photos and short video clips of the eye with timestamps on your phone
Watch for signs of blurred vision such as bumping into objects

03How Will the Vet Diagnose the Condition? Common Diagnostic Tests

The clinic visit will focus on an ophthalmic physical exam, with laboratory or imaging tests added as needed to identify the cause.

Full ophthalmic physical examination

assessment of the conjunctiva, cornea, and eyelids

Cytology

swab of eye discharge to examine cells and identify bacterial involvement

PCR or bacterial culture

to identify specific pathogens when necessary

Biopsy

may be arranged for complex or chronic cases requiring further investigation

Blood panel

to evaluate for systemic infection or concurrent underlying conditions

04Treatment and Care After Diagnosis: Medications, Diet Adjustments & Home Care

Treatment is guided by the underlying cause; follow your vet's medication instructions and attend all scheduled follow-ups to monitor recovery.

Use eye drops or oral medications as directed by your vet
Corticosteroids and other medications will be assessed by the vet for suitability in your dog's case
Severe cases may require hospitalisation for monitoring and supportive care
Schedule follow-up visits to monitor discharge, healing, and any changes in vision
If conjunctivitis recurs, your vet may refer you to a veterinary ophthalmology specialist

05What to Prepare Before the Vet Visit: Helping Your Vet Identify the Cause Quickly

Take clear close-up photos and short videos of the eye, noting the time symptoms began

Record the colour, amount, and onset time of the discharge

Note any changes in vision or signs of pain you have observed

Bring previous medical records, medication history, or any relevant test results

Use a secure carrier and avoid exposing your dog's eyes to bright light or irritants

It is advisable to call ahead to book an appointment or arrange a referral to a veterinary ophthalmology clinic

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.