I don't think that it is fair to call Asphixia careless because of what hapened to his dog. Many many people have dogs on farms or cottages, where they just run free. There is often times nothing that can be done about it. My Jack russel has been poked in the face several time by a porcupine at my cottage, and I do not think it has anything to do with my being careless.
I would think that being careless would be more like getting stuck buck naked in a pond, and having to get my neighbour to help me out.