Dog follows the instructions in a song playing

[JudyM]

4. Betting they were cuing him with a turn around signal.

My dad taught our dog to bark when he subtly moved a finger by his side. He used this to great effect, demonstrating to friends that she could “add” 2+2 (by moving his finger 4 times in a row), etc. Best episode was when showing her off to my grandmother one day he asked her what the square root of 16 is, and my grandmother jumped in trying to stop it, objecting sympathetically to the complicated problem our poor dog was faced with.