I hate slugs and have tried to stop them getting in the hutch but there are trails everywhere inside. I have even put copper tape around the legs of the hutch, (which I thought they could not touch), so I don't know how they are doing it? They must be able to jump.
Have tried pellets and I find a few dead slugs but some are still getting in.
Gross things tbh slugs were the clincher that got my girls' hutch permanently moved indoors.
I don't has the answer but I have a couple of evil ideas if you are up for slug cruelty. Stand each hutch leg on a garden plant saucer filled with salt. Or attach rough grade sandpaper to the hutch legs, all the way up, no gaps, no mercy.