Can my landlord who is an attorney file for an eviction and civil claim, then hire another attorney to rep him w/out notifying?

I don't see how this could be grounds for dismissal. Anyone has the option of representing themselves in a civil lawsuit (they are drawbacks to this, but it can be done) or hiring someone else to represent them. Sounds like you need to consider other options. See a consumer attorney in Columbus and review the complaint to see if you have options.