Your routine sounds like just about perfect for a grey. The shredded carpet probably was a combination of boredom and anxiety, but not your fault. When we first took Zephyr home, he would be totally fine for weeks at a time, lulling us into a false sense of security, then suddenly pinch an item he'd shown no interest in and destroy it. We managed to avoid that in future by leaving him with a kong stuffed with peanut butter hidden inside a cardboard box (whatever we had to hand that day: Amazon box, old cereal box etc). That way he had to work a bit to get it out and would sometimes direct his attention onto ripping the box apart after he had eaten the peanut butter. I think ripping things up is a stress reliever for some dogs. Like yours, Zeph has never really shown any interest in toys apart from little flashes where he'll briefly interact and then lose interest. The only play I do manage with him is a sort of quick movement thing we do which I learned from him. He'd sometimes get on the sofa with me and react to any movement I made very excitedly, and I learned how to mimic what he was doing to keep it going. You sort of freeze, then suddenly move, I sometimes try to mimic the huffs he'd make while doing it too. But even that lasts like 2 mins and then nope, that's it, I'm done. I should note that despite solving his occasional destruction, Zeph will never be safe around paper based products Books are best kept well away from him.