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This undated handout photo provided by the journal Science shows Gibson, a Great Dane, right, and  Zoie, a Chihuahua in Grass Valley, Calif. (AP Photo/Science, Deanne Fitzmaurice)
This undated handout photo provided by the journal Science shows Gibson, a Great Dane, right, and Zoie, a Chihuahua in Grass Valley, Calif. (AP Photo/Science, Deanne Fitzmaurice)

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