If you were going to use a ‘humane’ trap you would need to make very regular checks. It would be distressing for a hog (or a rat for that matter) to be trapped in one for any length of time. It is actually illegal to trap hedgehogs, so steps should always be taken to ensure that even a ‘humane’ trap is placed where a hog could not access it. But regular checks should still be made, just in case, because hogs are able to get into places which we may not expect.
It is also debatable about whether it is actually legal to release a rat ‘out in the countryside’.
