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šŸ¶ Benadryl Dosage Calculator for Dogs

Compute antihistamine dosing guidance based on your dogā€™s weight. Always confirm with your veterinarian before medicating.

Standard over-the-counter tablets are 25 mg. Check labels for chewables or liquids.

Safety Reminder

Use plain diphenhydramine only. Avoid products with decongestants (e.g., pseudoephedrine) or acetaminophen, which can be toxic to dogs.

How to Use This Calculator

1

Enter your dogā€™s weight

Provide weight in pounds or kilograms. Accurate weight ensures correct dosing.

2

Confirm tablet strength

Check the Benadryl label for the exact milligrams per tablet or ml if using liquid.

3

Select how often you dose

Veterinarians typically recommend every 12 hours for allergies, every 8 hours for acute reactions.

Formula

Dose (mg) = Weight(lb) Ɨ 1 mg/lb

Divide by tablet strength to estimate the number of tablets to administer. Always round to practical values and consult your veterinarian for final dosing instructions.

Full Description

Benadryl (diphenhydramine) is an over-the-counter antihistamine sometimes used under veterinary guidance to manage allergic reactions, itching, or motion sickness in dogs. The commonly referenced dosage is 1 mg per pound of body weight. This calculator provides a quick estimate, but individual health conditions, concurrent medications, and specific symptoms must be evaluated by a professional.

Remember to use plain diphenhydramine with no added decongestants, alcohol, or other active ingredients. Liquid pediatric formulas may contain xylitol, which is toxic to dogsā€”check labels carefully.

Frequently Asked Questions

Is Benadryl safe for all dogs?

Dogs with glaucoma, heart disease, high blood pressure, pregnancy, or certain medical conditions may not tolerate Benadryl. Always speak with your veterinarian first.

Can I split tablets?

Yes, tablets can be halved or quartered with a pill cutter to match the nearest safe dosage.

How quickly does Benadryl work?

Effects generally appear within 30 minutes and last 8ā€“12 hours. Monitor for drowsiness or paradoxical hyperactivity.

What if my dog vomits after dosing?

If vomiting occurs soon after administration or symptoms worsen, contact your veterinarian immediately.