“If you pick up a starving dog and make him prosperous he will not bite you. This is the principal difference between a dog and man.”
Variant: If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.
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Mark Twain 637
American author and humorist 1835–1910Related quotes

“The dog won't bite if you beat Him with a bone”
"Lowside of the Road", Mule Variations (1999).

" Malcolm X: Make It Plain http://www.pbs.org/wgbh/amex/malcolmx/filmmore/pt.html," from The American Experience, season 6, episode 6, PBS (first aired 26 January 1994)
Attributed
Hurry Home, Candy (1953)

“The man recovered of the bite,
The dog it was that died.”
Source: The Vicar of Wakefield (1766), Ch. 17, An Elegy on the Death of a Mad Dog, st. 8.
“When you walk a dog on a short leash, she's close enough to bite you.”
Source: Magic Bleeds

Dogs
The Note-Books of Samuel Butler (1912), Part XIV - Higgledy-Piggledy