Thank you everyone for the helpful suggestions. We called every major insurance carrier and lots of local brokers and unfortunately, there isn’t a whole lot out there for these situations. We eventually found a solution, which I wanted to post in case other people find themselves in this situation. We got Animal Liability insurance online through Xinsurance, which covers the dog only. We were then accepted by DC Assigned Risk (a DC government program for high risk insurance) for homeowner’s insurance, which excludes the dog and many other things.