Once Bitten, Twice Shy!
Another graphic sign, this time from a beach in Thailand, holds nothing back. Apart from the expected threat of dogs defecating, the ferocious Thai dogs circling this beach seem prone to a particularly painful form of attack!
If it has happened enough times to depict it on a sign, then it might be wise to shut the beach. Perhaps this is the source of those fat innkeeper worms washed up on the beach in California!