The instinctual choice is Edison; he's so energetic -- and wouldn't it be nice to have a peaceful night for once? In reality, he's not that great. He gets way overheated on even a moderately warm day and becomes distracted by the smallest things (oh, look! Is that a rock?!)
While Tesla is super laid back, she's also surprisingly athletic. She runs circles around Ed in the yard and makes turns that would surprise a professional driver. She's also a great running partner. She has no problem keeping up and running short distances (3-4 miles), and even keeps perfect pace!
Do you run with your dog? We want to know!