Years ago I had a neighbor on a farm that had a wolf hybrid dog. If you have never seen one you will be shocked- incredibly big and extremely strong. He had to keep it on a very thick chain. In the end it was pretty stupid to have a "pet" like that- it was so aggressive- even down right scary.
The dog eventually jumped from a second story barn loft, where the guy kept it, and it strangled itself on the chain. The urge to be free was too strong- I even think the animal committed suicide.