EAGLE — It was not a normal day in the park. A Vail man accused of assaulting and ultimately stabbing a man in a dispute over their dogs in Buffehr Creek Park last August pleaded not guilty Wednesday to charges he faces, putting his case on track for a possible trial in Eagle County District Court. Vail Police arrested Brian A. Wibergh, 51, after a fight between him and another man on Aug. 22. Prosecutors have since charged Wibergh with first- and second-degree assault with a deadly weapon causing bodily injury and menacing, all felonies; as well as third-degree assault, cruelty to an animal, and harassment, all misdemeanors.