May also be dominance thing kicking in or at interaction intended to do same as saying "hi, I am here". My dog does same. With mine as young adult, same pattern plays out with dog checking on each flock. My flocks are scattered out a bit. Periodically and during a disturbance (chickens indicating predator by making ruckes) dog goes to flock getting riled up and if unable to line out cause then he proceeds to check on all the other flocks in same manner. He usually makes it a point to trot through each group effectively pushing through. He seems good about not mowing / bowling over smaller birds.Sky has started to bump the chickens and turkeys. She is not nipping or chasing, but every now and then she'll bump one with her nose if the bird is in her way. For right now I'm allowing it. I think its her "polite" way of telling them to get out of he way. Any follow up chasing will not be tolerated.
So far I am extremely happy with her. She is very obedient and smart. The only thing she does that I don't care for is she wakes me up between 4 and 5am every morning. She doe have a small bladder and needs to go pee. She also gets bored when no one is with her in the wee hours of the morning and she will start to cry when this happens. I will ignore the crying, very hard to do. As soon as she stops I go get her. I don't want her to learn that crying and making a fuss will produce positive results. She is getting better. Most of the time she waits to hear my alarm at 5:15am before she starts up.