Gamin
Who or what was Gamin you may ask? Well, Gamin was the name of one of the two German Shepherds, the other named Zietta, that Frederick Prince Jr. brought back to the U.S. with him after WWI. During WWI, Frederick and his brother, Norman, served in the Lafayette Escadrille.
In addition to the name Gamin, there is a list of battles that the dog was apparently in including La Somme (1916), Artois (1917), and La Somme (1918). Gamin lived from 1915-1924 and is said to have been buried under this stone. But, he may not be the only dog buried here...