No Cohabitation Of Cats And Dogs

It is just now coming to everyone's attention that the city of Provo, UT has a law on the books allowing residents to have up to two cats or up to two dogs, but (strangely) not the combination of a cat and a dog.

I'm wondering if this is just a poorly-worded way of trying to limit the number of pets per household, or if someone actually thought there was a good reason to disallow the mixing of cats and dogs. It also sounds like, from the news stories, that it may be possible that the law was misinterpreted by a well-meaning shelter employee. Nevertheless, the city council will be considering changing the strange law, which is a good thing in any case. Utah is already famous for its byzantine liquor laws. We don't want to be famous for our restrictive pet ownership laws too.