The problem with zois is that most of the time they are really obedient and want to please you, so it's easy to get complacent with them. Then one day their instinct kicks in and they're just... gone. Sometimes that one time is all it takes for them to be gone forever.
This is a good read for anyone interested:
And I don't know if anyone remembers the time my SO took Strider for a walk in the woods and let him off leash when I expressly
forbade it. He may have been okay if I was there. Maybe. But he didn't really have a strong bond with him and definitely didn't listen to him.