Zyrtec Dosage for Dogs Calculator
Enter your dog’s weight to calculate the recommended Zyrtec (Cetirizine) dose.
Zyrtec Dosage for Dogs Calculator
Zyrtec (generic name: cetirizine) is an over-the-counter antihistamine commonly used to treat allergies in humans and yes, it’s often recommended by veterinarians for dogs, too.
It helps reduce itching, hives, swelling, and environmental allergies in dogs with minimal side effects.
Standard Zyrtec Dosage for Dogs
Veterinarians generally recommend the following:
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Dosage: 0.5 mg per pound of body weight
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Frequency: Once daily
Note: This dose is for plain Zyrtec (cetirizine) only not Zyrtec-D (which contains pseudoephedrine and is toxic to dogs).
Zyrtec Dosage Chart for Dogs
| Dog Weight (lbs) | Zyrtec Dose (mg) |
|---|---|
| 10 lbs | 5 mg |
| 20 lbs | 10 mg |
| 25 lbs | 12.5 mg |
| 50 lbs | 25 mg |
| 60 lbs | 30 mg |
For custom dosing, use our interactive calculator above.
Zyrtec Dog Dosage Calculator
To save time and ensure accuracy, simply input your dog’s weight into our Zyrtec calculator above. It will instantly provide the recommended dose based on your dog’s size.
Zyrtec Safety Tips for Dogs
Before administering Zyrtec:
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Double-check the product: Only use regular Zyrtec (no added decongestants).
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Consult your vet if your dog is on other medications.
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Do not use Zyrtec-D or human formulations with additional active ingredients.
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Use a weight-based approach (as calculated) to prevent overdosing.
Possible Side Effects
Though Zyrtec is generally well-tolerated, side effects may include:
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Drowsiness or sedation
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Vomiting or diarrhea
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Increased thirst or urination
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Behavioral changes (rare)
If you observe any of the above, stop administering and contact your vet.
Why Use Zyrtec for Dogs?
Zyrtec can be highly effective in treating:
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Atopic dermatitis
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Seasonal allergies
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Environmental triggers (grass, dust, pollen)
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Insect bite reactions
It works by blocking histamine receptors, reducing allergic response and inflammation.
Final Thoughts
Zyrtec can provide fast allergy relief for your dog when used properly. Our Zyrtec dosage calculator ensures accurate dosing based on your dog’s weight — but always speak to your veterinarian before starting any medication.