The advice given above is incorrect, and possibly downright dangerous so I have to comment.
Most of the American training programs by most of the big trainers specifically mention not to use the electric collar in the immediate presence of other dogs. It can lead to aggression problems when the dog associates the shock with the dog it was running at or even worse, a person.
Ayejay what you have here is as Hoon and Kawhia stated, a case where the level of distraction is greater than your level of control on the dog. Do as they both say and back off on the distraction, working on 100% compliance with known commands in a known low-level distraction environment such as your back yard, before you gradually increase distraction while maintaining 100% compliance. You have to think two steps ahead of the dog, anticipating when the wheels will fall off and being ready to correct him when it happens.
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