Pete Barlow was an old friend of mine. He had a dog-and-pony act and spent his life traveling with circuses and vaudeville shows. I loved to watch Pete train new dogs for his act. I noticed that the moment a dog showed the slightest improvement, Pete patted and praised him and gave him meat and made a great to-do about it.

That's nothing new. Animal trainers have been using that same technique for centuries.

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