How much energy can one 55 pound dog have??

This is the first day The Beast hasn't been doped up on oxycodone for a while. Each day as the narcs would wear off, she'd get really energetic and then go into coughing fits. She didn't cough much last night when I got home so here we are. In an effort to work off some of that pent up energy, we bladed twice around Greenlake today. 

She collapsed into the car when we headed home, so tell me, why is The Beast bouncing off the walls now? She keeps jumping and body slamming me. It's really funny, especially when she trips and summersaults.