I know nightshade is toxic but I can't remember the details. (And I have to run this am!) I'm pretty sure David C Hendersons, vet guide for sheep farmers, covers it pertty well even if its an English prespective. Some things get toxic or more toxic after a freeze though. You lost a lamb to a pepper plant? What kind? I had a break in to my yard this spring and they ate my green pepper plants with no problems. I'll look up what I can this evening if you can't get a better answer. I'll bet the Merk Manual could add something too.