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How to determine benadryl dosage for dogs 
Find how many milligrams are in a pill of benadryl. 
Different stores will sell benadryl at different concentrations. Read the label to determine how many milligrams of diphenhydramine a single pill of benadryl contains.
It's common for benadryl tablets to contain 25 mg, but some may contain a higher or lower amount. If you need to obtain benadryl, it should be available at any drug store, pharmacy, or supermarket.