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Greg O'Brien (left), with Colleen, Mary Catherine, Conor, and Brendan O'Brien, has been grappling with Alzheimer's disease for the last five years. Courtesy Greg O'Brien hide caption

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Courtesy Greg O'Brien

After Alzheimer's Diagnosis, 'The Stripping Away Of My Identity'

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If you need empirical information about what is happening in the brain of a dog to know that dogs think, then either you've never met a dog or your own humanity is in doubt. iStockphoto.com hide caption

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