bucky becoming a passionate defender of, and advocate for, so-called "dangerous" dog breeds and holding irresponsible owners accountable rather than the dogs who are very often abused, neglected and forced to become what people see as "vicious" or "aggressive" when in fact they are the exact opposite

he sees himself in those "dangerous" dogs everyone thinks will rip your face off if you look away for a few seconds, and even ends up rescuing one of them, a steel-and-blue pitbull with three legs and a whole load of scars from his days as a bait animal for dogfighting, aptly named sarge, who basically becomes his second shadow (the first is, obviously, his princess alpine) and follows him everywhere, comforting him during bad days and just being the sweetest, gentlest pup around, despite his harsh upbringing and severe neglect because people think all pitties are good for is aggression and offense

that, bucky has some experience with and can relate to