Hi Bluey,
How is Mushroom? My Taboo always bolts to break out into the free world, but I stop him and shake a newspaper to discourage the thought. He will always wish he could be outside. I got a long string and a cat leash and he did very well camping with the family. Perhaps leash walking would be enjoyable for Mushroom. Taboo even will get in his "taxi" to get fresh air now and then.