They attempted to reject a Clever Hans effect. >To minimize potential inadvertent cues from the owner, the instructions required the owners to place the dog's

They attempted to reject a Clever Hans effect. >To minimize potential inadvertent cues from the owner, the instructions required the owners to place the dog's toys in a different room. Owners were instructed to ask for each of the toys while ensuring that at least three toys were available for the dog to choose from. For the test they had a camera in the room with the owner and another in the room with the toys (so the owner couldn't cheat by removing the other toys).