Hi, I have a two year old female who is two weeks from giving birth. The last couple weeks she has been fighting with my older spayed lab usually in doorways, we have had to separate them. Yet she is fine and dandy with our two males. Now that the lab sleeps in her crate she barks at her in the crate. Do yall think this is a pregnancy thing? she wasn't like this before the last couple weeks. Or a dominance thing which I have no idea how to fix without rehoming a dog. Any and all advice is appreciated.