First I would suggest to doing bile acid tests to confirm a liver shunt if they have not been done yet. I am not well versed in liver shunts so hopefully a more expert person will chime in. But you do need to know if this guy has a shunt as diet plays an important role as do meds and if not MVD type then surgery.
I think part of this guys problem is that he is not neutered, but also that he is protecting you when walking from the big bad bike riders. However, biting is not acceptable. I suggest a trainer to assist you, they are the professionals and if your lil guy has gone down that slippery slope then a professional is needed. Too many guys like that end up in shelters for biting. Have you taken him to obedience, lots of socialization as an early pup?
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