It exists but no one is sure if it's origins. Some of the grave markers date back to the 1950s, but there are no official records of the pet cemetery. Consequently legends have developed alluding to burial grounds for 19th century cavalry horses or World War II guard dogs. But most likely it was just a spot for the military families who lived in the Presidio to bury their beloved pets.
And perhaps my favorite grave marker:
But maybe I'm just partial to wiener dogs.
Apparently the fate of the cemetery is unknown, as there's going to be a new approach to the bridge built sometime in the future. Hopefully the pet cemetery will be left unscathed, and appreciated as the folksy landmark it is.
In conclusion, here's a photo of the intense scaffolding that was under the bridge approach when I was at the cemetery taking these photos way back in March:
(Apologies to the Ramones. Except for Johnny. He was such a jerk.)