I'd LOVE to see Ceasar stop a Yorkie from bolting out the door, especially if they hear an UPS truck!
Mine were also trained to sit lay and then stay when someone came to the door, BUT the very second they heard the UPS truck, they went deaf and Azrael almost got ran over chasing after the UPS truck
. Now I keep an expen around the inside of the door. I will NOT take any chances with these little mind-of-their-own, selective hearing stinkers.