One thing that is very important for you to teach your chin is the "Come" command. Before you can even expect your dog to respond to "Come" you need to make it something positive. Immediately before your dog does something fun (going for a ride, dinner, walks, treats ect.) you need to say "Come". Do not use it for something negative such as grooming, bathing, or when you have to isolate your puppy. Also use a different command to bring your puppy inside. Coming in from outside is a big drag, on the same fun level as being left alone or ignored. Instead of using "Come" pick something like "Inside". Never use "Come" when you are angry. Do not chase your chin puppy if he does't respond. Practice it on lead for now, using a variety of treats to entice him. Never yank violently or choke your puppy to get him to come to you when he is on leash.