So the concept is: your dog scratches/barks at the backdoor asking to be let inside, so you let it in. Except you never had a dog. Or this isn't your dog. But you don't know that. Once you go to sleep with it in your house, bad things happen.
What does it do? How does it pick targets? How do we contain it?
Image > cute dog. click to apply antimeme filters, spooky monster.
Item #: SCP-XXXX
Object Class: Euclid
Special Containment Procedures:
Description:
SCP-XXXX is a phenomenon in which an entity (SCP-XXXX-1) will appear in the backyard of a random house and await entrance to the house.
SCP-XXXX-1 is a large, canine entity that exhibits a memetic effect causing it to appear as a common domesticated dog. The memetic effect causes the person perceiving it to believe it is a beloved household pet. The entity will enter the home and enter a passive state until all other occupants have gone to sleep. Once REM sleep is entered, the entity will [DATA EXPUNGED].






Per 


