I don't like the sound of those raised liver and pancreatic enzymes, and wonder whether it could be abdominal pain which is preventing him from enjoying his food. If his blood chemistry is not right, this could well show in the condition of his coat - I was reminded of this today when I wrote of one of my past girls who was not able to digest fats. Her coat became very coarse and sparse until the condition was finally diagnosed and she had the correct supplement. I think I would be inclined to change onto a hypoallergenic food as soon as possible. If you are suspicious, it doesn't have to be the one that your vet sells - my vet gave me some rough guidelines and left me free to experiment when my Beagle boy's ulcerative colitis was diagnosed. I soon sussed that maize was the primary allergen in his case, and started him on a grain-free food with a novel protein source - (duck, white fish or rabbit varieties) - and as few ingredients as possible. The most common allergens seem to be wheat, maize, gluten and chicken, no doubt there are others. You will need to test feed each product for at least a month to six weeks to be able to judge the results. Not at all related to your query, but my boy's illness turned out to be due to an auto-immune condition - increasingly common these days. He went on to develop non-malignant bowel tumours, and hypothyroidism, but his general health status remains good at 10 years of age.