I've heard of "she-wolf" (partially from mythology, partially from pop music), and I'm wondering which animals "she-" can and can't be used on.
Wiktionary mentions a variety of animals (she-ass, she-bear, she-cat, she-dog, she-elephant, she-goat, she-monkey, she-wolf) but apart from them all being placental mammals, there doesn't seem to be anything in common between them - some are domesticated, some aren't, some are carnivorous, some are vegetarian.
Which animals can "she-" and can't be used on, and why?
I tried looking for information on this, but came up with http://www.usingenglish.com/forum/threads/115063-she-horse and http://lydbury.co.uk/forum/index.php?topic=2148.0 which don't fully answer my question.
The online etymology dictionary doesn't have any information about she as a prefix.