Help please - my 3-year old Lab has suffered with blocked AG all his adult life. After trying a number of different dry foods he now eats raw plus veg and some fruit. But this has not been the answer. Vet says keep adding fibre - but which and how much? He weighs 30 kg, is fit and healthy and has lots of exercise (except when Storm Ciera hits!) However he does not drink much water so I add extra to his food. Anyone able to help?