A Dog Named Him: Presidential Pets

There is a room that most don't know exist. Within these four white walls, an entire world plays out, hidden away from the eyes of every human. The Presidential Pets are a group of animals that are owned by various Presidents of the United States. These animals work together, traveling through time and space, to solve mysteries, fix problems, and keep the world running as it should. But there's a strange darkness rising in the distance, and suddenly a new rash of problems are cropping up all throughout the various times. Can these animals band together in time to solve the problems? And, even more important, can they come together in time to figure out what's causing them?