In Ohio, your ESA housing rights rest first on state law. Ohio landlords are independently bound by Ohio Revised Code § 4112.02(H) and Ohio Administrative Code 4112-5-07(C), which prohibit extra charges for an "animal assistant." This state protection is enforced by the Ohio Civil Rights Commission and remains fully active. The federal Fair Housing Act (42 U.S.C. § 3604) provides the same obligation, and that statute has not changed.
Landlords in Kettering who refuse a valid ESA letter or continue charging pet fees may be in violation of ORC § 4112.02(H) and federal law. Complaints can be filed with Ohio Civil Rights Commission.