Unless Ohio has a state statute forbidding insurers to refuse to write for "dangerous" dogs, then individual insurers can refuse to write a policy in Ohio where the homeowner has a GSD. Some will not even let you waive coverage. So check with your insurer.
The only state wide BSL in Ohio is for "pit bulls". The home owner's insurance issue and the BSL issue are not the same though. I know an OH GSD breeder who lost her home owners insurance after years of no issues because the company changed their policy on GSDs.