Ha, this sounds exactly like our Springer Spaniel. She is highly focused, extremely agile, never really misbehaves, but absolutely looses her marbles if there are squirrels in the yard and she is inside.

It's like she views her entire purpose as eradicating the yard of squirrels. But if I put her outside while I'm working, she comes back immediately to the door and waits for me to watch her chase the squirrels.

She also does the head tilt nearly every time I talk to her.