Under Ohio law, all dogs three months and older are required to wear a valid year license. Not only is it the law though, it’s your dog’s ticket home! A 2023 Montgomery County dog license can be traced 24 hours a day, 365 days a year, meaning if your furry friend gets lost, they can be reunited with you. Licenses are $20 for dogs that have been spayed or neutered, and $24 for dogs that are unaltered.