Practice, practice, practice. Now, practice some more. Teach your dog that all good things in life hinge upon him first sitting in front of you in a behavior named "come." When you think he really has got it, test him by asking him to "come" as you gradually add distractions and change locations. Expect setbacks as you make these changes and practice accordingly. Lower your expectations and make his task easier so he is able to get it right. Use those distractions as rewards, when they are appropriate. For example, let him check out the interesting leaf that blew by as a reward for first coming to you and ignoring it.
Add distance and call your dog to come while he is on his retractable leash. If he refuses and sits looking at you blankly, do not jerk, tug, "pop," or reel him in. Do nothing! It is his move; wait to see what behavior he offers. He'll either begin to approach (mark the behavior with an excited "good!"), sit and do nothing (just keep waiting), or he'll try to move in some direction other than toward you. If he tries to leave, use your correction marker—"eh!"—and bring him to a stop by letting him walk to the end of the leash, not by jerking him. Now walk to him in a neutral manner, and don't jerk or show any disapproval. Gently bring him back to the spot where he was when you called him, then back away and face him, still waiting and not reissuing your command. Let him keep examining his options until he finds the one that works—yours!
If you have practiced everything I've suggested so far and given your dog a chance to really learn what "come" means, he is well aware of what you want and is quite intelligently weighing all his options. The only way he'll know your way is the one that works is to be allowed to examine his other choices and discover that they don't work.
Sooner or later every dog tests his training. Don't be offended or angry when your dog tests you. No matter how positive you've made it, he won't always want to do everything you ask, every time. When he explores the "what happens if I don't" scenario, your training is being strengthened. He will discover through his own process of trial and error that the best—and only—way out of a command he really doesn't feel compelled to obey is to obey it.
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Are You Under The Negative Influence Of Hyped Media Stereotypes When It Comes To Your Knowledge Of Pit Bulls? What is the image that immediately comes into your mind when you think of the words Pit Bull? I can almost guarantee that they would be somewhere close to fierce, ferouscious, vicious, killer, unstoppable, uncontrollable, or locking jawed man-eaters.