Hi Dion. Have a look at my page on the best cat scratching poles. Ottherwise, you may need to visit your vet every few months.

I couldn’t leave a comment on your linked article ‘how to keep indoor cats happy’ and there are two things we do that weren’t mentioned, and both have a big positive impact on our cats.

1- We got a pet stroller. Yes, you get some odd looks from people but the cats LOVE it. They especially love going out at twilight when bird life is active. They are completely safe contained in the stroller, away from lunging dogs or people wanting to pay them.
The bonus is they ask, not demand to go out for walks (unlike when we harness trained them and they screamed to go out on all four paws) and when the stroller isn’t in use they use it as a bed to snooze in.

2- We trained them to use a cat wheel. This has been our single most expensive but best purchase, they all love their wheel and use it day and night, unprompted. Bax and Ax really go like the clappers and they burn off excess energy on it every single day. It’s great for physical and mental stimulation! When we moved interstate and the wheel got packed away for a fortnight, the cats were all utterly bereft and got into loads of mischief because they were so bored.

We got the Ferris Cat Wheel, as it is well designed, sturdy and safe. We had a cheaper model prior but it de-railed and sent Axel flying- luckily he wasn’t hurt. Suffice to say, it’s worth paying more for the the quality safe model!