I have a pregnant female last night got in my closet no puppies yet. But my other female who is much older woke me by growling at her like she wants to kill her. She has never acted like that before. Could it be puppy time ??? I have them separate now cuz this has never happened before. Would my other dogs turn on her cuz it is close to time? I am so confused cuz for years they have always been so close and never aggressive towards each other.