I own a pure blooded 150 pound Bull Mastiff and I am a fulltime RVer. Fang is verry goodnatured and never off leasch but Problems always could arrise, mostly due to the ignorance of others And i do would like to protect myself as well as my Dog. In our (legal) sociaty some folks just itching to sue over everything and anything if the can avoid workin for a living and i had to work too hard to be able to affort my live and livestyle as to give it up to some lowlive. thanks Tom

You have a lot of issues here and it's my opinion that you only own a big ugly dog because you like the reaction you get from people, but whatever. The coverage would be part of your homeowners policy if you own a home. If you're a renter, possibly on your renter's policy.
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you vet should be able to recommend some company's.

Your homeowners insurance, or your renters insurance if you rent.