Hi Kassie
You could try narrowing the height of the tunnels, as well as having the twists and turns. I think cats find it harder to get through a shallow tunnel with twists and turns, (If squashed downwards they tend to get wider so it’s not so easy to turn sharply), whereas hogs can get through shallower heights more easily. It’s really a matter of trial and error until you get the height/width that the hogs can just get through but the cats can’t.
You could try reducing the height of tunnels/corridors by raising the floor – using offcuts of wood or bricks.
Cats sometimes enter tunnels/corridors at an angle, so if you put an obstable (such as a heavy flower pot) in the way of that, it sometimes helps.
You could also try strategically placed water trays, which cats don’t tend to like. Although that’s not quite so nice for the hogs, either, at this time of year!
For the best solution you really need to carefully watch the cat to see how it is behaving.
