Dog Benadryl Dosage Calculator
Use our Benadryl dosage for dogs calculator to estimate diphenhydramine dose from your dog’s weight. Get dosage in mg, plus liquid (12.5 mg / 5 mL), 25 mg tablets, and 12.5 mg chewables. Includes a dosing-by-weight chart and how often Benadryl is typically given.
What Is Benadryl for Dogs?
Benadryl is a common brand name for diphenhydramine, an antihistamine that veterinarians may use for allergic reactions and itching in dogs. :contentReference[oaicite:0]{index=0}
Dosing depends on your dog’s weight and individual factors (age, other conditions, and other medications). Many sources reference veterinary guidance in the 2–4 mg/kg range given every 8–12 hours, which is roughly 0.9–1.8 mg per pound. :contentReference[oaicite:1]{index=1}
This calculator provides an estimate based on weight and then converts that dose into common forms: liquid (12.5 mg / 5 mL), 25 mg tablets, and 12.5 mg chewable tablets.
Benadryl Dosage Formula
A common rule-of-thumb is about 1 mg per pound, and many references also cite a broader veterinary range of 0.9–1.8 mg/lb (2–4 mg/kg). Always confirm with a veterinarian before dosing your dog. :contentReference[oaicite:2]{index=2}
This matches the common 1 mg/lb rule-of-thumb. Some veterinary references cite 0.9–1.8 mg/lb (2–4 mg/kg). :contentReference[oaicite:3]{index=3}
Because 12.5 mg / 5 mL = 2.5 mg per mL.
This can be a decimal value depending on weight.
This can be a decimal value depending on weight.
Benadryl Dosage by Weight Chart
Quick reference using the 1 mg per lb estimate, plus common form conversions (liquid is 2.5 mg/mL). :contentReference[oaicite:5]{index=5}
| Dog weight (lb) | Dose (mg) | Liquid (mL) | 25 mg tablets | 12.5 mg chewables |
|---|---|---|---|---|
| 5 | 5 | 2 | 0.2 | 0.4 |
| 10 | 10 | 4 | 0.4 | 0.8 |
| 15 | 15 | 6 | 0.6 | 1.2 |
| 20 | 20 | 8 | 0.8 | 1.6 |
| 25 | 25 | 10 | 1 | 2 |
| 30 | 30 | 12 | 1.2 | 2.4 |
| 40 | 40 | 16 | 1.6 | 3.2 |
| 50 | 50 | 20 | 2 | 4 |
| 60 | 60 | 24 | 2.4 | 4.8 |
How to Use This Calculator
- 1
Enter your dog’s weight (lb).
- 2
Read the dose in mg.
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Use the conversions shown to see the equivalent amount of liquid (mL), 25 mg tablets, and 12.5 mg chewables.
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For dosing frequency, many references cite every 8–12 hours (2–3 times per day), but confirm the schedule with your veterinarian. :contentReference[oaicite:4]{index=4}
Frequently Asked Questions
Many references cite 2–4 mg/kg (about 0.9–1.8 mg/lb) every 8–12 hours. A common rule-of-thumb is 1 mg per pound, but the safest approach is to confirm the exact dose with your veterinarian. :contentReference[oaicite:6]{index=6}
Common guidance referenced by veterinary sources is every 8–12 hours (2–3 times per day), but frequency can vary by dog and situation, so confirm with your vet. :contentReference[oaicite:7]{index=7}
Diphenhydramine may be used in dogs, but product selection matters. Avoid combination products with added ingredients unless your vet directs you, and confirm the dose for your dog. :contentReference[oaicite:8]{index=8}
Benadryl is sold in multiple forms. The calculator converts an estimated mg dose into liquid (12.5 mg / 5 mL), 25 mg tablets, and 12.5 mg chewables so you can see the equivalent amounts.
Only use a product your veterinarian approves. Plain diphenhydramine products are commonly referenced; avoid multi-symptom versions unless specifically instructed by a vet. :contentReference[oaicite:9]{index=9}