Our expert says:
There are many causes of conjunctivitis in dogs.
These include; bacterial infections, corneal diseases, disorders of tear production, eyelid infections or abnormalities and viral infections - for example distemper, exposure to allergens/chemicals.
When I test an eye I usually do a shimmers tear test - test for dry eye (Kerato-Conjunctivitis Sicca) and a fluorscene test - checks for corneal ulcers and patency of the nasolacrimal duct.
The blocked nostril maybe important as this may interfere with the natural drainage from the nasolacrimal duct from the medial canthus of the eye
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