動物在這些電影中,必需要至少在電影大綱中被突顯出來才列入計算;經過這樣的過濾,最後剩下59部電視劇或電影。同時,對於有續集的電視劇或電影,研究人員將它們合計為一部(除非續集在超過20年後才上映)。接著,研究人員從美國犬業協會(AKC,American Kennel Club)處得到由1926-2005年所有的飼養犬隻的註冊資料,總共有超過65萬隻寵物狗的註冊資料。研究人員比對電影上檔的時間、在戲院播映的長度,並將電影中的特定犬種在電影上檔前後十年的註冊數進行比對之後發現,電影可以增加狗明星品種的普及度長達10年。例如,1943年「靈犬萊西回家」(主角是牧羊犬)(Lassie Come Home)的時候,牧羊犬註冊增加了40%。
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