Sorry to hear about the chick carnage. some dogs have a strong prey drive and go nuts when they're around chickens. and it takes a lot of training to teach them not to. i was horrified when i took my new 6 mo old pound puppy over to a new boyfriend's house, and the first thing she did was bust through a flimsy chicken enclosure and kill one of their pullets. i empathize with you!
now that i have my own chicks in the brooder, i am building a STURDY fully fenced (including the top) chicken run. between the dogs, neighborhood cats, hawks, raccoons, etc it'd be asking for trouble to do otherwise. it IS possible to train a chicken killing dog to leave them alone, but it takes some work!!! so in the meantime for the chickens sake just keep 'em separate.
p.s. my dog is now 3 years old and is really protective and sweet with these chicks, maybe since she knows they're "ours". but i still wouldn't trust her alone with fluffy, spastic, noisy, darting creatures...she has a strong prey instinct and i don't want to tempt her.
good luck with your chicks! are the RIR's gonna be your flock, of the neighbor kids'?