Well, if you live in Provo, Utah, you can't own both! That's about to change. From USA Today:
The truth about cats and dogs in this city is that they aren't allowed to live in the same house. But that's about to change.Current city law allows residents to own up to two dogs or two cats at the same time — but not a dog and a cat together. After getting complaints, the City Council is expected to change the law next month.
Never attribute to malice what you can attribute to stupidity. My guess is that someone just didn't get the conjunctions right.
Yours,
Wince