Comment by jancsika

To properly test, you'd need to:

1. Draw a triangle on your forehead

2. Make a shitty clone of yourself with a circle drawn on the clone's forehead, who comes out of the shop immediately after you walk in

Then see if your dog decides to follow the shitty clone, or whether it waits a couple minutes for the regular version of you.

Edit: also, repeat with many more dogs, many more dog owners, and many more shitty clones.