It's the size of the fight in the dog...

We are hoping that someone can tell us who made this statement prior to Mark Twain saying it. We have looked for numerous hours and all sources come up with Mark Twain as well as Dwight D, Eisenhower, Bear Bryant, Archir Griffen, Barry McGuigan, Duane Davis and Mike Scott. Our problem...none are the man our baskeball coach is looking for. I have no clue where else to look and am hoping someone out here might be able to help me. It was before Mark Twain is the only other thing that I know. Thank you in advance.