Running felt so good. He couldn't run like this as a human, with this much speed or this much abandon - he'd be sure to fall down and hurt himself. Being on four feet definitely had its advantages.
He ran through the trees, surprised at how much she seemed to be catching up with him. Of course, she was probably more used to running like this and more used to these woods, which could only help her.
Finally, after several miles, he stopped, panting, turning back to face her with a playful light in his eyes. He walked up to her, and bumped her gently in the shoulder with his paw.