Curse of the Apostrophe

Apostrophes are powerful pieces of punctuation. With one stroke, a writer can change a plain old plural noun into a proud owner. However, some seem to view the apostrophe as mere decoration to be used at the whim of the writer. Both of these signs had a 50/50 chance of choosing the correct use of the apostrophe, and both chose poorly.

"No dog's allowed" would seem to imply that the "allowed" belongs to the dog and that there is none of it. Perhaps I should bring my dog there to increase their supply. (Thanks to Kate for spotting this victim of poor apostrophe usage.)

A caveat: Perhaps what this sign is attempting to convey is "no dog is allowed." Although it is an unconventional use of the phrase, I must concede it is possible.

And once again, my office parking lot provides yet another source of mangled English. "Towed at owners expense" doesn't make any sense at all. I plan to use this logic as a defense in court when I get sued for refusing to pay my towing fee.