Do not fall prey to the illusion that your dog will definitely never run away. It does not even have to be the dog’s fault. For example, he could get lost in a crowd. He could start chasing a hare across the field or, just for once in his lifetime, taste freedom by crawling under the damn fence. What then? You run around the streets, call your dog’s name, drive around the shelters and post up posters with his photo on pillars.