The useful example is UI control hierachies. GUI’s was one of the early sucesses of OOP. Those “Dog descend from Animal and has a bark() method” just confuses the issue.

Inplementation inheritance is a useful tool when you need it, but it’s not that central to OOP.

I would like to see one. Ideally one that has the functional programmer rewrite things. I don't have any bias besides being completely ignorant about classes. The tutorials do talk to me about cars being a sub class of vehicles and the prevention of rewriting things. My mind goes like: "Hierarchies? seems bad?: You have buildings and vehicles with cars belonging to vehicles and habitats belonging to buildings. Where put the RV? Are writers children of nationality or is nationality a child of writer?" iow the example is probably to unrelated to programming to be a sensible one.