Ah right... Our robos have 10mm mesh on theirs but I will admit I'm less secure about it than if they had 6mm mesh. They do have stuff to climb though and haven't got to the roof yet despite that. Personally I do wonder if Whizz isn't trying, but they do ok anyway lol
Plus only Muffin even might still be growing and she's the same size as Whizz already either way.
Good luck sorting out remeshing or whatever you do decide to do