Who said "I admire the serene assurance of a dog with a bone."?

This quote is attributed to Mark Twain.

I admire the serene assurance of a dog with a bone. - Mark Twain

"I admire the serene assurance of a dog with a bone."

Mark Twain Humor

Novelist American 1835–1910

"The secret of getting ahead is getting started."

"If you tell the truth, you don't have to remember anything."

"The man who does not read has no advantage over the man who cannot read."

"Kindness is the language which the deaf can hear and the blind can see."

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."