"On" or "Off"

Emme has two speeds: "on" or "off." She has never discovered "medium." If she had a dial with a scale, she would be either set at 1 or 100 per cent. She is a ball of energy or asleep. Last night we were riding in the car and she would be this wild thing for the first few miles: looking out the window, smelling the car, growling at pedestrians, licking my hands, and sniffing the window pane. A few miles into the ride, she would settle down and nap the rest of the ride. She is the same thing playing in the house: jumping on Rudy, chewing on a toy, barking to get up on our laps, chasing a ball, running around doing the "blitz," definitely "on." After a time of 100 per cent play, she lays down on her side, or sometimes on her back, and naps. All "on" or "off," no "medium."