We crate trained our puppy since he was 2 month old. Today he is 11 month. While we at home, he is free to go around. But when we go out, we put him in his crate. He doesn't have a problem with that as he is used to it. However, at some point, we would like to start leaving him free around the house. What is the way to do that? What age is the best? I have to say that currently he is a bit "playful". He might occasionaly jump on the couch, eat the socks or slippers or do something else.