Sorry Charlie, but there is none! If a kid wants to pull the dog's tail, telling it not to 50,000 times ain't gonna stop it. Lecturing it on the feelings of the dog, the immorality of being a bully, etc., will not mean squat if yanking the tail is fun. Sending it to its room (where it has plenty of toys and distractions) won't get the job done. Other than bribing it, which will set a very bad precedent, nothing will...and especially nothing advocated by Dr. Spock in his libtarded books. Permissive parenting (which took hold in the 1960s) can be directly traced to the rise in bullying, juvenile delinquency, leading on up to adult crime. Research it!
Kids need lines in the sand. They need Gandalf yelling "You shall not pass!" They need clear limits and boundaries set and enforced! In other words, they need a parent and guardian...not a clueless buddy! They need to learn above all else that choices and actions have consequences, and bad choices and actions bring forth equally bad consequences. That sort of self-control is never instilled from pretend punishments. It just aint! This is not to say you have to be dictator and eager disciplinarian, ever ready with a paddle, switch or slap. The punishment should fit the 'crime', just as there are times when a parent should be blind and deaf to minor infractions. The goal is not to terrorize, but to temper innate ferality with self-restraint. As an adult they may want you to be their buddy, but as a child they NEED you to be a parent...and teach them what they have to know to be a decent grownup.