It's a book that a teacher let me read of his it is about this girl who she can transform into a panther and there is a guy in the book who he is really full of himself and he could transform into something and he tells the girl that they belong to each other but she likes a mortal. Or at least I think that the guy she liked was a mortal. Could any body please either find it out or tell me.
P.S. the book isn't an animorphs book. On the cover it has like a girl with black hair I think.

My son used to read a series of books called animorphs. Not sure if that is it but its worth looking up.

Or could any body tell me any good websites I could go to look for it by description.