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The movie is based on a novel of the same name by MacKinlay Kantor which in turn is loosely based on the tale of Old Drum , a foxhound which is said to the inspiration of the " Man 's Best Friend " speech in 1870 .
 MacKinlay Kantor, Old Drum
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 MacKinlay Kantor, Old Drum