Koda usually couldn't care less about chickens. He see's them every day and has virtually no interest in them. I've walked him into the chicken yard and he just doesn't really care. I've even had him loose in a paddock and a couple of dad's chickens will run through the paddock... Koda will chase them but come back as soon as he hears me call... or if he does reach them he just sniffs and checks them out.
Anyway, so as my chicks have been growing up, the roosters have become quite protective of their yard and hens (which is what i want, good for protection from eagles and it might help with foxes if one ever got brave enough to come near Koda). Koda has noticed this, and has developed a bit of a "game" with them. He'll stop doing it if i tell him to, or call him away, so its not a massive problem, I find it quite amusing actually lol
Quite often its the roosters that start it. If Koda is hanging around that area, the rooster will follow him up and down the fence until he comes near, crazy things. I'm selling the pure white rooster, who is the one that does it most, so that will stop it happening a bit.
ETA: Its probably not a behaviour I should be encouraging though haha! Most of the time I just ignore it, he only does it for like 1 minute at a time anyway, then he's bored and goes away, lol.