“Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.”

—  Groucho Marx

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

Adopted from Wikiquote. Last update Nov. 2, 2021. History

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Groucho Marx 117
American comedian 1890–1977

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