My 8 week old pup has had diahrrea for a while now, and when i asked the vet about it she said it could be because of the change of food or atmosphere shocking his system when i got him. It's been two weeks almost and he still has it, though he is very well acclimated now. He has been wormed twice, first set of shots, and minimal exposure to other dogs. Anyone have any ideas on an herbal treatment or something?