How many holes can possibly be left?

I have lowered the fencing… well, actually, Lenny did but he did so at my request. I have built little hills of rocks at every place where it seemed the dirt was separated from the bottom of the fence enough to entice a small dog to attempt to make a break for it. I’ve had Lenny nail sheets of metal over openings too big to cover with rocks. I’ve pulled wooden flower tubs in front of gate areas. I’ve done everything but wrap the house in shrink wrap to make it escape proof. So how does Carm still find a way to slither under the place with even the slightest opening showing and get out? Sigh….