After which, Harmon still brought his dog to work, which in turn led Perrette to speak out for those who felt the situation was wrong.
After some time and tension, leading to Mark Harmon and Pauley Perrette filming on separate schedules, Perrette’s Abby exited NCIS at the end of Season 15, along with Duane Henry’s Clayton Reeves.
Those assaults were revealed to be alleged attacks by Mark Harmon’s dog on an unidentified crew member.
Eventually it came out that “multiple physical assaults” were allegedly the driving force behind her departure.