hhmmmm......
i havent had experience with this but, let me see if i can help
-probiotics: are you giving them regularly? i would start with a lot to heal gut and then maintenance amount daily.
-does he drink enough water? maybe too much fiber and not enough water makes it runny...
-is his diet pretty well rounded: fresh fruits, and lots of vegetables, whole grains etc?
other than physically, does he seem nervous about anything? how long has this been going on?
and lastly, if you think it is definitely something physical maybe seek the advice of a trained homepath or something along those lines, because you might just have the dosage of things not right. i hope he feels better soon
i havent had experience with this but, let me see if i can help

-probiotics: are you giving them regularly? i would start with a lot to heal gut and then maintenance amount daily.
-does he drink enough water? maybe too much fiber and not enough water makes it runny...
-is his diet pretty well rounded: fresh fruits, and lots of vegetables, whole grains etc?
other than physically, does he seem nervous about anything? how long has this been going on?
and lastly, if you think it is definitely something physical maybe seek the advice of a trained homepath or something along those lines, because you might just have the dosage of things not right. i hope he feels better soon
