You may purchase or renew your dog license online by going to the Clermont County Auditor website and selecting Dog License Information. The license fee is $16 per dog and should be purchaseed before July 1st to avoid penalty. Under Ohio law all dogs older than three months of age must be licensed (ORC 955.01). The law applies regardless of whether the dog is kept inside or out. Link to the Clermont County Dog License Information page.