Hi, I have had pigs that wheek so loud it is amazing and others that don't bother. My three don't wheek much. They are so spoiled they don't have to! Under stress, like when the vet is doing something to them they don't like they will 'scream' loudly. At home they get excited and chew on the bars when they hear food coming. Dee www.sunnyday1.blinkz.com