Hey Flap would USCCA cover dog bites if people broke in, for civil lawsuit
From my past reading, dogs are not "weapons" and would therefore not be covered by self defense insurance policies.
As stated, homeowner's insurance MIGHT cover you. There are some areas and insurance policies that label certain breeds as "extremely dangerous," like German Shepherd, Doberman, Pit Bull, Rottweiler, etc. Those may get you sued if they attack regardless of the situation, because they are "known to be extremely dangerous breeds -- keep them at your own risk."
I've seen that in many states, having a "guard dog" that's not on the "high risk" list and signs warning of "Big Dog," "Guard Dog," "Watch Dog." or any other signs won't protect you from legal action. If someone sees the sign and enters anyway causing the dog to bite them, you are still held liable. If you lock your gates preventing casual entry by others, you might be able to fight it. Otherwise, warnings can only stop people who are smart enough to heed warnings. They won't protect you nor the other person should someone stupidly enter your property and get bitten.
Owning a dog you hope will protect you is discouraged by government. They prefer you only own "alarm" dogs -- little dogs that can't seriously injure anyone but rather starts barking to alert of possible danger. This is more for deterring burglars who prefer homes that won't create noise that can alert neighbors.
That concept of no-bite dogs kind of flies in the face of the Hawaii HPD comments of "get a big dog." They need to elaborate. A big dog is more intimidating and more likely to deter trespassers. But you should only get one which doesn't bite people.
We can't win for losing. Self defense and protection of ones family and property is a crime in this state, it seems.