He is best known for being the owner and trainer of multiple dogs, most notably London, who starred in the Canadian television series The Littlest Hobo.

[3]: 2  He graduated from high school in 1937 and joined the Army shortly afterwards,[2] where he became a military baseball pitcher in the Schofield Barracks league's 8th Field Artillery Regiment team while serving in Honolulu between 1937 and 1938.

[4] Eisenmann was noticed by Detroit Tigers scouts during this period,[2] who bought him out of the military to play professionally.

[5] In 1939, Eisenmann took spring training at the Tigers camp in St. Petersburg, Florida, where he injured his arm.

[4] While playing as a member of the Lake Charles club, Eisenmann was one of the 88 minor league players who Judge Kenesaw Mountain Landis declared as free agents on January 14, 1940.

[4] In November 1941, the San Diego Padres bought Eisenmann's contract,[11] where he remained for the beginning of the 1942 season after showing an impressing performance during spring training.

[4] He coached for the United States army team for the Tea Bowl I football match against Canada, which took place in London on February 13, 1944.

He rejoined the San Diego Padres to play for the 1946 season,[4] but was later assigned to the Tulsa Oilers on June 17.

He appeared in an additional five games after rejoining the San Diego Padres, who then released him on April 29, ending his professional career.

[4] In 1947, Eisenmann was a nightclub owner in Los Angeles, where he bought his first dog,[18] who he named London, which was where he served in the Army.

[25][26] During a baseball game on June 26, 1955, London gave the pitcher his jacket upon reaching base,[27] which angered two umpires later that day.

[46] London starred in the 1963 Canadian television series The Littlest Hobo based on his 1958 movie, but by this time Eisenmann had three more dogs, Toro, Litlon and Thorn, who also played in his spot.