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How to catch a runaway dog
Follow the dog.
If you are with the dog when it runs away, discretely follow it and keep it in view without chasing it or being too obvious. At some point, the dog will stop to check out a smell or dodge a person and that is a potential time to move in closer.
Try not to make it evident that you are tracking the dog or it will see your pursuit as a game of chase and run even faster. Entice the dog with tasty treats.