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How much Benadryl should I give my 5-pound puppy for allergies?

Updated On September 23rd, 2025

Pet's info: Dog | Shetland Sheepdog | Male | 2 months and 8 days old

How much benadryl for 5 pound puppy

1 Answer

Most Helpful Answer

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Answered By Destini R. Holloway, DVM

Veterinarian

Published on March 6th, 2016

The calculation for Benadryl is quite simple, it just 1mg per lb , so for a 5 lb dog it would be around 5mg. Since Benadryl comes in 25mg usually this is close to 1/4 tablet and there is a wide safety margin for Benadryl so 1 or 2 mg above or below is well tolerated. Expect some drowsiness just like in humans.

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