Our two boars are about 18 months now, we've had then for 6 months.
They both eat the same food, GP1 eats more, he's bigger.
My little GP2 ,bless him, passes the most horrendous wind 
vom face.
I've looked online ,Peter Gurney had an article about bloat, but he doesn't have the symptoms.GP2 passes normal, well formed droppings and occasionally, when I lift him up, he's got a big soft pooh in his bottom .But he goes off and passes it. (I got a heck of a scare at New Year when I first saw this and gave him a manual clear).
AFAIK the softee ones are his eating ones, I've never seen them in his bed.
But, he's cuddles up and just slips them out (the farts).No noise, just the smell.
GP1 never does it.
These are my GP 13 & 14 that I've owned. My boar that I had as a child would occasionaly pass gas.
But this little guy is toxic.! But well in himself, slim, active, no bulgey tummy, clean undercarriage.
Anyone else have an Ozone Layer Buster?