Food, food, and more food! Rats LOVE food and will tame down quickly with food rewards. A bit of peanut butter on a bite of bread or a piece of fruit like watermelon or apple will have him coming out of his hut in no time. Reward him with treats when he is gentle, talk to him and in no time he’ll be waiting for you when he hears you come into the room. Rats are very intelligent and positive rewards always work woth most animals, including us. lol