The new fence is finally done so we were able to leave Cracker's dog door open to the yard while we went out for the evening. The only problem was we used to have a bunch of bricks blocking off the space under the gate, and the workers must have thrown them out. We still had a few left and Charlie thought there was no way Cracker would be smart enough to escape. I wasn't so sure so I added some construction vehicles (um yeah, not so hard to get through it turns out). When we came home 4 hours later Cracker came running up to our car in the parking lot to greet us. He obviously has no desire to run away, he just wanted to go with us. And though he is smart enough to get out, he was not smart enough to get back in.