Yes, Bailey is very perseptive.
She has an xlarge size bubba kong that she loves!
I am surprised she can even carry it! We had bought it for a doggie guest for xmas and Bailey would not let her have it AND SHE WAS A 100LB DOG!
We have tried to hide it from her when she is in another room (get annoyed with all the sqeaking) and she will start jumping up and down if it is on the counter or will sit by a cupboard or drawer to wait until we give it back to her; and she will wait for hours.
How does she know??
