Hi ppabel1
You could try lowering the height in the ‘passage’ area. It doesn’t look as if there’s a lot of height, but hogs can get through a lower height, when there are bends, than cats can. If the cat has to flatten down due to the height, it’s not so easy for it to turn back on itself. You could try using offcuts of wood to raise the floor. I used bricks in mine, but think it was a bit higher in the first place, but the hogs had no problem climbing over them. It really needs to be a fairly long stretch of reduced height, with turns in it. It’s a bit of trial and error, as you found with the width, to get it just right.
Good luck.
