Sounds as if you have the cat situation pretty well covered!
If you get the chance, it might be worth weighing the small hog. The recommended minimum weight for hibernation is 450g. If the hog is less than that, it might need to go to a hog rehabilitator to be over-wintered. There are some tips on weighing etc. on this topic:
Sometimes you will get a hog who decides not to hibernate at all – I had one here last year. He visited every night except about 2 when there was snow that was too deep, even though I cleared a path up my garden for him! We had some pretty cold nights last winter, but he still turned up, although he did disappear into a nest he had made in one of the food boxes, for a warm up between snacks.