I found this. Hope it helps
My vet told me to give 1mg per pound too. Childrens Benadryl is 12.5mg per 5ml. 5ML=1tsp. A ml is the same as a cc. If your pup weighs 3.4lbs she should get 3.4mg which equals to 1.36ml or 1.36cc or you could round it off to 1.4ml using a syringe.
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