Aww poor guy, he's lucky that you found him! The vet is your best bet, you don't want to be digging around with something like that!
He's got to be in some pain or discomfort, but the relief when the vet gets it out should be instantaneous.
Edited to add more useful info:
I've had to soak a geldings sheath to loosen and soften a big hard bean. I was also advised to use mineral oil, but I stuck with warm water just to ensure I didn't irritate the skin. I've never dealt with a bean of the size your guy has though.
Does he have trouble urinating? Any straining, funky stances or dribbling? Your vet may get him on antibiotics if he's at risk for infection.
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Last edited by Lins; 05-11-2012 at 12:50 AM.