From Pet Connection website:
A couple months ago the California state Department of Transportation (CalTrans) got itself in some hot water when it took the body of a service dog killed on a highway directly to a rendering plant instead of to a shelter for IDing.
Turns out the golden retriever’s body could have just been pitched over a cliff like so many others. San Francisco TV station KPIX was tipped off to the secret “pet cemetery” used by the state agency’s workers:
http://www.petconnection.com/blog/2007/09/30/caltrans-secret-pet-cemetery-discovered/