Max Scratch Test

My father and I were sitting at our kitchen table, Max was laying on the floor.
Me: Have you noticed that Max doesn’t seem to do that thing where if you rub a dog’s belly, one of the legs starts going?
Dad: Of course he does.
*rubs standard dog-leg-whirl spot
Me: Don’t think he does.
Dad: Don’t worry, I’ll find it.
*minute of scratching Max’s belly*
Dad: Hm..
*few more minutes of scratching Max’s belly*

After five minutes of varied rubbing and scratching, Max’s leg didn’t move but I think Max was fine with us trying.