I just lost my 14-1/2 yr old corgi (old age) and my chicks used to follow her like a mother hen. I just got a spree young whipper snapper of a corgi, and he saw the chickens and immediately knew what to do! I am sure the chickens didn't like it one bit, but they sure did know where to run where it was safe. He did a fantastic job of herding them without touching them once. Some nights prior to getting him, I'd be running around and around, (like a chicken with my head cut off?) he sure made things easier. I was impressed how strong the herding instinct was, and how he just seemed to know what to do..It wouldn't be every time just when they are being naughty birds..
Before the dog, I picked up a fishing net at a yard sale, and they hated that and would run for the coop. A good long stick seemed to work too. The whooshing noise seemed to make them go to the coop too.