IMO, anyone who has dogs and chickens should train their dogs around their chickens, beginning when they're chicks. This certainly doesn't mean that all dogs can learn to be trusted around chicks or chickens. But I think it improves odds if your dogs learn that these appealing, mouthwatering, feathery creatures belong to YOU, and are part of the family pack. So that even folks who keep their dogs and chickens separate all the time will have a better chance of chicken survival if one somehow ends up on the dog's side of the fence.
Of course with tiny chicks, I would be highly protective when exposing them to your dog(s), as a dog can move pretty quickly (like talltimber's mastiff). My golden and great dane both do well with my big chickens, and I trust them together unsupervised. However, I only trust my dane with my 7-8 week old chicks when I'm out there with them, as their peeping and fast movements has him quivering with a "play" mindset sometimes. I feel strongly that he would have no goal of eating a chick, but I worry that he would run and jump and land on one with his huge paws (he's still puppyish). I know once they're calmer and not cheeping, he will be as great with them as he is with my big girls.