My husky could get through a hole I would not have thought possible to get her nose through. She was often escaping her pen to be waiting on the front porch when we got home. She didn't want to go anywhere just loved the mental challenge of escaping. She and her mate ( a malamute mix) were the best dogs I had ever owned but at the time I was in college and had LOTS of time to work with them. Now, not so much. She went through her canine good citizen but failed the last test since she kept calling the pack back. Oh well.... she was a great dog, good mother, and lived to the ripe old age of 17 years. Even mostly blind and mostly deaf she enjoyed "escaping" when my DH opened up the gate to drive the lawn mower into her pen.
RIP Shadow