One of the reasons I like weres or shifters in romance is because animal that the person can turn into adds cultural and character traits to the love story that might not otherwise be there.
There is a theory that all shifters should be predators but I am not so sure. I really want Nalini Singh to come through with the non predators Changelings in the Psy/Changeling Series as Romantic Leads.
Here are some great unusual shifters that are not wolves, big cats, snakes, birds of prey, dragons, nor my beloved bears. These are in no particular order.