We have two akitas. Generally, they are really good with the chickens. On two occasions, each akita (one male, one female) were accidentally left outside alone with free ranging chickens. We came home to chickens roosting on the akita. If the chickens startle, however, the dogs figure, yeah! time to chase! So, we mostly keep the girls cooped and the dogs out of the backyard. (The female akita also likes to dig in my gardens.)
However, we did have one bad incident with the dogs. One of our chickens went down last summer from the heat and the humidity. We were trying to get her back to 100 percent, but it was taking quite a while and she was not doing particularly well. She did not smell like a health chicken, either. One night, the akitas opened the pen she was in, pulled her out, and killed her. I think they went after her because she smelled sick and not healthy like the other birds. Since then, their behavior toward the other healthy chickens remains as before, but we are super, extra careful not to leave them unattended with each other.
However, we did have one bad incident with the dogs. One of our chickens went down last summer from the heat and the humidity. We were trying to get her back to 100 percent, but it was taking quite a while and she was not doing particularly well. She did not smell like a health chicken, either. One night, the akitas opened the pen she was in, pulled her out, and killed her. I think they went after her because she smelled sick and not healthy like the other birds. Since then, their behavior toward the other healthy chickens remains as before, but we are super, extra careful not to leave them unattended with each other.