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It could be impaction but he sounds very young to be suffering from it already. Try and give him a clean so he can have some relief. I would also consider getting him checked out. Is this the first time you’ve noticed it? Boar Care: Bits, Bums & Baths
I do see this with some boars having one half in and half out. Particularly if they are a bit chunky or a bit inactive. Just keep a regular check on his bum to check he doesn’t get an impaction. But at the moment, that is nothing much to worry about
I have a 9yrs old who needs regular sack cleaning and I know it's impacted if I gently feel his sack between my fingers. You would feel a lump inside. He actually never has poo stuck like on a picture. One of my other older boys does that, tho. Usually walk in to find him stretched on a cuddly bed, with his boy parts on display and poop hanging out
Never found anything inside his sack during their 'boar MOT'.