1-2 mg per lb.

The upper range is for battling anaphalactic reactions (e.g. bee stings, or as my Barney encountered- yellow jackets). Most allergies will respond early on to the lower range.

For example a 50-70 lb dog can safely consumed 50 mg of Benedryl at night and 25 mg in the morning. Clear gel caps seem easy to give as they have a thin sweet coating. My previous dog would actually bite into the gel caps and consume them that way. If puppy doesn't like the gel caps, smear a little peanut butter on them, and down the hatch they will go.

P.S. The only problem with 50 mg at night is that you might end up with a snoring dog!