According to a post from the City of Janesville, all dogs and cats over five months old must be licensed, and have a valid rabies vaccination. You can get a license for $15 if your animal has been spayed or neutered, and $25 if they haven’t been. Licenses can be acquired from the Clerk-Treasurer's Office at City Hall on North Jackson Street. Renewals can be purchased through March 31. After that day, a late fee will be accessed.