Thanks for the replies. It will be easier to train him now that it is getting cooler, because the chickens don't really come out of the barn. My dad has been keeping him on a long leash when he goes to potty and he's able to be free when he's supervised. He believes that Sam was just playing with the chicken, but too roughly. He's got to learn even playing is not allowed. Thanks again.

Yes, he's lived with us since he was 9 weeks old, so I'm sure he's still adjusting.