How do you keep your Pomeranian entertained when they’re home alone during work?

I’ve got a super sweet (but fiendishly energetic) little Pomeranian who spends about 8–9 hours by himself while I’m at the office. I hate knowing he’s stuck all day with nothing to do! I’ve tried leaving out a few toys, but he often loses interest after ten minutes and just naps (or gets into trouble 🐾).

What are your go‑to tricks or setups for keeping a solo doggo happy and mentally stimulated?