For the past couple of of days one of my flocks (20 hens, 2 roos) hasn't been acting right. In the morning they all will come out as usual, eat, get a drink and scratch around, but they all will eventually go back into the house and stay in there all day I have checked all of them to make sure they have no injuries or any sign of being sick. They look normal, but stay inside all day. Our neighbors recently got a new dog right behind the fence. Could this be the cause. I am very concerned and need help.