Ask your dog to come. Praise every step he makes towards you and correct every step that is made away from you. When he gets to you, praise him lavishly and give him a treat. To get him started, you may need a treat to start out with. But make sure you don't have to rely on this.
Most dogs find a treat less appealing than a squirrel or a cat.
If your dog doesn't come to you, put yourself in less dominant positions. Standing can look very confrontational. Try getting down on the floor and make cooing noises. Again, make sure you and your dog don't rely on this. Make sure the rewards are more fun than watching you embarrass yourself.