There are about 438,000 dogs in Oakland County but only 65,000, or 15 percent, are licensed. For many residents, they are completely unaware that it's state law for dogs, four months of age and older, to have a license and be vaccinated for rabies. That's a problem and it's illegal. That's why each year, from June through September, animal census workers from the Oakland County Animal Shelter Pet Adoption Center go door-to-door, across the county, stopping at homes where signs of dogs have been exhibited but records indicate there is no license for that home.