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 dayI 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.