"Crap!"

He definitely heard the barking, so he shoved the blanket back into the corner, hurried out of the room, shutting the door behind him, before shifting back to rat. This way, he figured, he could hide if he had to. Running along the hallway, he ran up any flight of stairs he could (he probably wouldn't be able to get high enough to exit through the crack he'd dropped through originally), until eventually he found himself in the attic. Investigating, he found a gable vent screen.

He wiggled through the vent, chewing on the screen until he got through, then squeezed his way out, gripping onto the outside of the vent once he did so, and looking around. Seeing a branch of a tree nearby, Roddy launched himself, scrambling onto the branch, before climbing along it to get down, his hook-like claws digging into the bark, and his long tail moving from side to side to help him keep his balance as he slowly made his way back down to the ground.

Once there, he took off, running back to where he'd gotten in at so he could grab his key, before running back to Sirius.