This memorial listed all the parents and all the pets.

“The Congressional Cemetery or Washington Parish Burial Ground is a historic and active cemetery located at 1801 E Street, SE, in Washington, D.C., on the west bank of the Anacostia River. It is the only American "cemetery of of national memory " founded before the Civil War. Over 65,000 individuals are buried or memorialized at the cemetery, including many who helped form the nation and the city of Washington in the early 19th century.” (Wikipedia http://en.wikipedia.org/wiki/Congressional_Cemetery)

Cenotaphs, posted earlier: