One thing I noticed in your post is that the pups were downstairs with your 10 year old daughter. Since you just got Mizzi a few months ago, is it possible that she has developed an attachment to your daughter and was maybe "protecting" her from Spirit, or got jealous of Spirit being too close to her? It's possible she's never done it before becuase she has recently developed a bond with your daughter now that she's well settled.
__________________ "The little furry buggers are just deep, deep wells you throw all your emotions into." ~ Bruce Schimmel   |