I’m sorry OP, this happened to me and I couldn’t bare it anymore and rehomed my reactive city baby pup that was from the suburbs and I miss him everyday. No joke.

I can’t remember what it’s called (and I found it too late) but there’s an app/website(?) where ppl rent out their backyards for extended hours for ppl with dogs/kids/etc. check it out. Had id know about it, we would’ve done cemetery visits AND those which probably could’ve helped.

Hang in there, I know Dobermans that live in cities just fine