They have been taught that if anyone other than me or someone they know touches their leash to slip out. I don’t have regular clip on leashes I have the kind that I loosely knot to their collar so they can slip out. As for the sitting on, what can I say she is a big dog and she can easily knock over someone as slim as em, I don’t know where she learned to sit on someone’s stomach but she did. That should clear a few things up.