Allergic conjunctivitis in the atopic dog: how to treat it
2-year-old French Bulldog with diagnosed atopic dermatitis. In spring it develops bilateral conjunctivitis with hyperaemia, clear mucoid discharge and periocular pruritus, and rubs its eyes. Schirmer 20 and 21 mm/min. Fluorescein negative in both eyes.
What is the most appropriate management?
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A. Broad-spectrum topical antibiotic for two weeks
There is no evidence of primary bacterial infection. Antibiotics do not act on allergic inflammation, and repeated use promotes resistance.
B. Topical ciclosporin as the only option, because topical corticosteroids are contraindicated in any conjunctivitis
Topical corticosteroids are only contraindicated with ulceration or herpetic infection. With negative fluorescein they are useful and fast-acting in flare-ups.
C. Topical corticosteroid (or antihistamine/mast-cell stabiliser) during flare-ups, saline flushes to remove allergens and control of the underlying atopic dermatitis
Correct. Once ulceration and KCS are ruled out, allergic conjunctivitis responds to topical anti-inflammatories. In chronic cases, topical ciclosporin or tacrolimus allows the corticosteroid to be reduced.
D. Conjunctival culture and sensitivity before starting any treatment
Normal conjunctival flora gives positive cultures of no significance. With a typical allergic picture and normal tests, it is not indicated initially.
lightbulb Key takeaway
Conjunctivitis is common in atopic dogs and is usually bilateral, itchy and seasonal. Before any ocular corticosteroid: Schirmer and fluorescein. Controlling the underlying atopy reduces ocular flare-ups.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.