Where can you call for liabilty insurance for your rotweiler?

What are you wanting to insure him against? Bite? Contact a good agent and they will be able to help you, if you have home owners insurance your liability coverage may provide coverage, (but subject to many exclusions and facts of loss)...If this is a known vicious dog, I doubt you would find coverage anywhere, and may be opening yourself up for lots of trouble. If you would like to be more specific perhaps I can help you.