Can Dogs Take Zyrtec for Itching?
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Zyrtec comes in 5 and 10 milligram (mg) tablets. Only use plain Zyrtec (cetirizine) and avoid use of Zyrtec-D due to potentially serious side effects. The dose for dogs is approximately 0.5 mg per pound, or 0.5 mg/lb, 1-2 times per day, not to exceed 20 mg per dose.