What do you think has gotten Dobson so spooked and gave him that arched back? Look at his puffed up tail and his posture. His back is arched in that classic cat defensive stance and he’s making himself appear larger as cats do when they feel threatened. Not only is he using his body language, but his face is clearly showing some concern. But don’t worry, Dobson was never in any kind of danger!
Here’s a closeup of his paw taking some very tentative steps! But don’t worry, it all turned out fine. He only caught sight of a friends dog which is what almost made him have an involuntary bowel movement!