[url=http://www.ncbi.nlm.nih.gov/pmc/articles/PMC548625/[/url]
Treatment of canine atopic dermatitis with cetirizine, a second generation antihistamine: A single-blinded, placebo-controlled study
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The pruritus was satisfactorily reduced in 4/22 (18%) dogs that completed the trial with cetirizine. Two dogs vomited after administration of the active drug.
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That is in line with other antihistimine and dog which is typical about 10-15% efective at treating allergies.