OK, bear with me while I try to describe this odd behavior, or rather, what I did to evoke it. I was calling Shadow to me from another room, and was trying to pique her interest with a different sound. I was sitting on the floor and used my fingers to quickly "crawl" back and forth over the carpet, making kind of a small critter scampering sound. She came to check it out, and started grunting and lunging at my hands. She never grabbed me - no biting or scratchingor anything, just chased-grunted-lunged at my hands. When I stopped she just went on to hop around until I did it again, and she resumed the behavior. Just a few minutes after I quit doing it she flopped down next to me for a while. I don't think she was scared or upset about it. Is this just a playful behavior? I've never heard her grunt before.