Using a shotgun will spoil the meat. This guy will eat 'em when times is tough.
Or you could catch 'em like the Victorians did - tanner a tail, no questions asked, guv'.
I had a renter with just one rat. Little bugger burrowed under the concrete front door slab, got up under the stairs and helped itself to whatever it could find around the house. Not that little, the burrow could have taken a small cat.
We had/have rats. The slabs by our front door aren’t flat any more. The pest controller didn’t think it was relevant but the slabs are right by the inspection chamber