Actually it is better to feed a small meal more frequently, listen to the vet. An overly large meal or repeated instances of big meals may trigger a fast. I would feed one 10% body weight food item every 4 days until he refuses then switch to same % weight every 7 days until back on feed. So on and so forth. This should be the case especially for males. Feed big meals, risk going off feed. I have had males fast for 13 months, a male that small may not make that hike.