Here's a link that give you the dosage on benadryl and hydrogen peroxide. The only thing I want to add on to Jeanie's post is that hydrogen peroxide (even diluted) is no longer used to treat cuts because it eats flesh. Up until a couple of years ago I used it too until my vet chewed me out saying I should know better than that.
http://groups.msn.com/chinutchihuahu...rstaidkit.msnw
From the web:
Here's some info. on hydrogen peroxide.
What you should NOT use is alcohol or Hydrogen Peroxide. You can use either of them (diluted at 50%) for an occasional cleaning but both of these products are too harsh for daily use in healing wounds. Hydrogen Peroxide was once used for these types of wounds for it's debriding ability, however, since about 1996 the course has changed and wound care specialists have come to realize that too much tissue damage occurs to healthy cells that are needed for wound healing when Hydrogen Peroxide is used. HP is considered "cytotoxic", meaning deadly to cells, thus it actually inhibits wound healing. Unfortunately, many doctors and nurses and are not informed that HP is no longer recommended for wound healing and they give their patients instructions that actually SLOW DOWN the healing process.