He had 3 doses (W, F, M - in evening, an hour after meal) and we went for a test on Wed. All was good - minor changes from a week ago, but all within normal range. He was given another 3 weeks supply, but after the Wed dose, he wasn't too interested in breakfast on Thurs or dinner Thurs night or Breakfast on Fri. He did eat all the meals, but took him nearly 2 hours when normal is a few minutes. Last night, he ate fine, and got another pill. We'll see how he eats this morning - he's just been fed. Thanks for the feedback. If the pattern continues, I'll definitely call his vet.