Fat Dan's Dog Theory

Theory Concept
This theory surrounds the idea that the dog in Episode 2 (and, briefly, Episode One) belongs to a man named/nicknamed "Fat Dan", and that the house in which the first episode was filmed is Fat Dan's house.

Evidence

 * At around the 18:41 mark of Episode 3 Part 1, a mysterious message that reads "spot fat Dan's dog" (or perhaps "spot Dan's fat dog", although that interpretation seems less likely based on the orientation of the words) appears on a door. The identity of this "Dan" or his dog remains unknown, but speculation has begun that the dog seen in Episode 2 might be "fat Dan's dog" (instead of the dog being Lincoln's dog, Scooby), and "fat Dan" owns the house that the first two episodes were filmed in. If this is the case, the "spot" in the message may be challenging the viewer to find the dog, which admittedly could be difficult if you managed to look away when the camera zooms in directly at it.

Additional Information

 * While not necessarily evidence to support the Fat Dan's Dog Theory, Lincoln claiming to have obtained his dog by means of thievery in I Turned Myself Into A Cookie!!!!!! could spin this theory in a completely different direction, where this message is actually Fat Dan himself attempting to contact the viewer about his missing dog and urging them to find it.