With 4 tests with two different vets and it all came back negative, I'm thinking it's a matter of you finding the right food for him. It's just going to be a long line of trial/error. If you haven't, I'd say try out the THK.
As for the leg lifting, again.. since the tests came back negative, I'm guessing he's marking. Especially since he's not neutered yet. Be sure to clean the areas REALLY well to prevent him from keep going back. Maybe have him tethered or restrict his boundaries until you have him retrained. |