So far, our mastiff hasn't caused our homeowners to go up...
I'm only reporting what happened to me when I called a couple of companies to get a new policy when I moved. It may differ from state to state and maybe depends on what laws are in place holding insurance companies responsible for pet actions.
Compared to some other dog, or to no dog at all?
When I signed up for homeowners their only question about pets was, do I have a dog. They could care less about cats, geckos, or alligators.