Cleveland's trainer won a bull terrier in a bet and quickly he was made the team mascot and cared for and adopted by outfielder Jack Graney (pictured). Larry traveled with the team, was the first dog to "meet" a sitting U.S. president and according to the Society for American Baseball Research "entertained fans before games by leapfrogging over players' backs, chasing down fans that carried straw hats, and retrieving foul balls in batting practice." Larry died in 1917 following injuries suffered in a fight with another dog.
Library of Congress, Prints & Photographs Division, LC-DIG-bbc-1886fLibrary of Congress, Prints & Photographs Division, LC-DIG-bbc-1886f
Tut, St. Louis Browns, 1923
Much to the chagrin of Browns manager Lee Fohl but to the delight of the players, outfielder Johnny Tobin bought a monkey from an out-of-work actor in New York City for a reported $25. Tobin brought the monkey on the road with the team. Tut drove the St. Louis boss bananas, but the team got great joy seeing him jump from shoulder to shoulder of players during trips. Alas, Tut died when someone -- supposedly traveling secretary Willis Johnson -- fed it sugared tobacco.
Library of Congress, Prints & Photographs Division, LC-DIG-ggbain-34847Library of Congress, Prints & Photographs Division, LC-DIG-ggbain-34847
Charlie-O, Kansas City/Oakland A's, 1963-76
When the A's moved from Philadelphia to Kansas City, the Governor of Missouri gave the team owner a mule -- the state animal of Missouri. The owner, Charlie O. Finley, named the mule after himself. For a time, A's players would ride Charlie O. -- the mule, that is -- from the bullpen into the game after warming up. The mule went on the road with the team, and former A's pitcher Catfish Hunter said Charlie O. stayed in better hotels than the players.
The Mets were not a good team in the late-1970s (95+ losses each year from 1977-80). The daughter of the team owner came up with the idea of having a mule as a mascot and a contest was held among fans to name it. Mettle would walk through the field down the foul line before a game and was stationed by the Mets' bullpen in a pen of its own. Needless to say, Mettle didn't help the Mets win or attract more fans and his time as a mascot ended quickly.
While technically an "unofficial" mascot of the Brewers, in 2014 Hank-mania swept Milwaukee swiftly after the stray dog was found near the team's spring training ballpark and quickly adopted by players and coaches, who took care of him throughout February and March. The dog was brought back to Milwaukee and you can now find Hank T-shirts, pennants and plush dolls, as well as find Hank in his own doghouse at Miller Park.