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A powerful dog, often a mastiff or part mastiff, bred to be a watchdog and traditionally kept chained.
[Middle English band-dogge : band, leash, chain; see band1 + dogge, dog; see dog.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Animals) a ferocious dog, whether by nature or trained as a guard dog
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. any dog kept tied or chained.
2. a mastiff or bloodhound.
[1250–1300; Middle English bande-dogge; see band3]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.