There are so many "peaceful" animals...in fact, I think that most animals are peaceful, except when pursuing prey for food or defending their territory to protect their young or to earn mating rights. Animals are by nature, peaceful. We could learn from them. I love most all animals (I say "most all" because I am not fond of certain reptiles) but dogs have to be right up there at the top of the list for me. What many people do not realize, because they subscribe to force-based training which in my opinion is wholly unjustified, is that dogs are perhaps the most agreeable creatures on this earth, perfectly suited as human companions. They are easily trained and totally willing to do what we ask so long as we are not abusive and are clear in our requests. I vote for dogs as the most peaceful creature.