Well, yes, maybe his dog was too smart for this. But, I’ll ask you this - why did all those people film themselves holding up a sheet in front of a dog, then quickly hiding on the other side of the door when they drop it (and the dog sometimes freaking out and sometimes not)? Is the viewer going to say “Hey! I know what happened - the person is just behind the wall!”
Also - this is one of the dumbest things to argue about, and I think that we can both agree on 
