Totally agree with msvette. Time for the crate. Our dogs are so sensitive to changes in their schedules. My GSD came home from the shelter at age two. She was not destructive and never needed to be crated. A few years later, my father got sick. I was back and forth to the hospital at odd times. My GSD chewed up my watch, a cell phone and a table leg. She went into the crate. Something to chew. Soft music on the radio. She was fine. For your sanity and Ivan's safety, put him in the crate.