On appeal from a $16,000 judgment in a personal-injury case, Steven Campbell — who claimed he suffered severe spinal pain and disability plus $200,000 in lost wages after Kevin Autenrieb’s unleashed dog knocked him flat on his back — argued that cross-examination of his treating physician (a neurosurgeon who attributed Campbell’s symptoms to the violent encounter with the dog) was improper because it was based on the defense attorney’s unjustified speculation about possible alternative causes …