Have you actually worked with him on the command "come"? Dogs don't just automatically know what you want them to do, or what the English language means. If he is not coming to you at least 80% of the time when given the command, he does not *KNOW* how to come when you call him. If you need some help to teach him this, PM me and I will help you. In the meantime, do not chase him- that makes it a fun game for him, and he will continue to run. Also, never ever punish him when he does come to you, no matter how badly he has been behaving, as that will make it much less likely he will EVER correctly respond when you call him. If he won't come to you when you want him to, try walking backward away from him, and going in the house (hide inside the door and wait for him to come to the door). This usually will work, as its no fun to run from somebody who isn't playing along.