“When a man's best friend is his dog, that dog has a problem.”
“In many respects, my best friends were dogs.”
Source: The New Canada (1992), Chapter Two, Transitions, p. 33
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Preston Manning 18
Canadian politician 1942Related quotes

“Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.”
This may be original with Groucho, but the Quote Investigator http://quoteinvestigator.com/category/jim-brewer/ mentions the earliest report found in a 1958 issue of Boy's Life magazine where it is attributed to Jim Brewer.
Misattributed
Variant: Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.
Source: The Essential Groucho: Writings For By And About Groucho Marx

“In Aberdeen, I hated my best friends with a passion, because they were idiots.”
As quoted in The Daily Of The University Of Washington (1989-05-05).
Interviews (1989-1994), Print

As quoted in The Twentieth Century (1972) by Caroline Farrar Ware, p. 429

Terry Gifford, LLO, page 696
1900s, Stickeen (1909)

“You’re my best friend, Shmuel,’ he said. ‘My best friend for life.”
Source: The Boy in the Striped Pajamas

“Paper is my best friend and paper seller is my worst friend!”
Quoted in Humor & Caricature (April 1995), p. 3