Well, I would have thought that
Gandalf would be more suitable for a cat. After all, we all know that cats have nine lives and Gandalf has had at least two ...
A Doberman? Here I was thinking along the lines of a blonde longhair like a golden retriever or great dane. Then
Legolas might do the trick--funny how no one has yet suggested this fleet-footed namesake--which could be shorted to "Las", to confuse the (male) dogs.
Or you do go one up from the Zeds and do Y:
Yrch.
Then there's the Sindarin for fangs,
Carack or
Carag. Or go with
Ulfang.
Or something more sophisticated such as
Cćnînion.
Rawr!