Jasper knows the "come" command pretty good, I also thought about that and tested it today.

Jasper LOVES kids so I got Samantha(little girl I babysit) to lay on the floor and even wave his toy in the air, he ran towards her and I told him to "come" and he turned around I did not expect it to work at all and thought I was wasting my time, he's been surprising me alot lately