Hahaha! So your items where replaced by computers? That's just funny!
About that stray dog thing.... I had a few problems with interacting with animals when I was playing a family on this lot: I couldn't control them anymore. Sims couldn't interact with them, and often dogs and cats sinked through the wall of the second floor straight into the Show Car Garage, for some odd reason.
Replacing the floor didn't help and I have no idea what was wrong.
Apperently Grim was going to ring the bell after my own pets where taken away and the Grim came for that stray dog that for some reason couldn't leave. That explains that grave which I've forgotten to remove before uploading.
I'm telling you: weird things happen when you're building big. These aren't just luxury problems anymore.