Wait...you let your beardie just wander around with your cats? I can't think of any other reason it would need to be defending itself from cats. Why not keep it in a proper enclosure? That way you don't have to worry about it defending itself and how tough it is wouldn't matter.

If you're worried about how well it can stand up to cats it's not going to make all that much difference whether it's a leatherback or not, teeth and claws will find purchase either way.


Maybe I was reading that wrong, but it seemed like you were concerned about your cats getting at a new one and your current one fends them off....