Yes, the leaves can give humans a very sore tummy but won't kill you. Our vet said it would be unlikely to kill our sheep but then Jaykay said her friends goats died when someone fed some to them, so you never know. We did have a large fruit garden in our last place and the hens were always scratching around under the huge rhubarb leaves there, didn't eat any. Most animals know what not to eat, just some are a bit more adventurous (sadly).