Diesel at 9 weeks old   When Diesel came home, he was a chubby, nine-week-old Rottweiler with oversized paws, an oversized personality, and a spark of confidence that filled the room. I remember his first night home—he trotted around as if he’d always lived there, exploring every corner with the self-assurance of a dog who knew exactly who he was. That confidence, though, came with something else. Within a few days, I noticed subtle signs of resource guarding. Diesel would fr