On a friend’s Facebook page, we’ve been discussing whether various werecreatures should be hyphenated or not. I usually don’t hyphenate unless it would put two vowels in a row. I WOULD hyphenate were-elephant, were-umbrella, were-aardvark.
Although, as I noted, if you’re a were-aardvark, you have bigger problems than whether your condition is spelled with a hyphen or not.