Thanks so much! Rico is neutered and does know the "sit" and "down" commands. I moved in with my aunt and before I lived with Rico he barely got any attention. My aunt has two 2-year-old twins and that takes up most of her time and energy. Rico will be 5 this year and ever since my aunt got him from the shelter he has been chewing and humping the covers. I will try the things you suggested and see if he turns around in his ways. Thanks again!