Okay, so every few nights, all of the sudden, Darla will get so wound up that it isn't even funny. She starts growling (playfully) at Charlie and running around him like a crazy person. We've started calling her Linda Blair b/c we are waiting for her head to spin like the exorcist. It is the weirdest thing I've ever seen. It comes out of no where. She is CRAZY! She will just be relaxing, and then all of the sudden, watch out Charlie... This goes on for about five minutes or so and then she's back to being normal....