So how many hognose do you have, I have been keeping hogs for 9 years and I have NEVER seen what you are talking about, fur can pass through the digestive track and does not come back up after 48 hours. Anything that comes back up after 48 hours to 5 days is a regurgitation regardless of the species.
More fur than waste in waste material is not uncommon it does not happen all the time but it does and it not coming back up but down 
Some of you need to disect fecal material 