How Much Zyrtec Can I Give My 100 Lb Dog?
How Much Zyrtec Can I Give My 100 Lb Dog? The standard Zyrtec dose for dogs is generally 0.5mg per pound of body weight, not exceeding 20 mg per day. How much Zyrtec can you give a large dog? Cetirizine (Zyrtec) 1⁄4 – 1⁄2 mg per pound (one 10mg tab per 30-40 lbs) twice daily.