Here's how a tombstone of a pet dog get some people really upset:
When Judy Hagan lost her beloved rat terrier she bought two plots at the local cemetery, one for her and one for her dog. Eight years later she decided that it was time to put a memorial stone at the dog's grave. And that has stirred up a lot of controversy, because the dog has a name that some people say are not appropriate for display on a tombstone...
The dog's name? Shithead.
Link - via Boing Boing
In other news, I've heard of a lab named Black Jesus. Personally my wiener dog is nicknamed Little Shit or Shit Eater. It's not uncommon.