My tri color corgi puppy's name is Charlie and he is going to be 7 months old here in a week. He is the most stubborn dog in the entire world and I just don't know what to do. When he was really young, about 3 months, we had him sitting when we asked and sometimes laying down. But this was only if he got rewarded with a couple shreds of cheese, he wouldn't do it for anything else. And then he suddenly just stopped listening even when cheese was in front of him. So we sort of dropped sit for…