They started with a floor-to-ceiling scratching column covered in 395 feet of pink-dyed sisal and connected to a wall-to-wall beam just below ceiling height.
“Initially, the cats would run full speed down the hall chasing each other, go up and over the top of the two couches and climb up the column and race along the beam and hit a dead end where it connected to the wall," says Walker.
To solve this problem, they extended the beams through the walls, running them from room to room to create 140 feet of cat pathways. They added more roaming space with ramps and staircases.
These walkways lead to ceiling-high hiding-holes and lookout stations, because as Walker explained, “everyone knows cats like to look down on us.”
Walker and Mooney have written a book that goes into more detail about their pet friendly home modifications, which is entitled The Cat's House.