Dog-Play has a very informative site. Click on the logo at right to go to their home page for a list of things to do with your dog. Another super dog play site is the California Dog Fun Directory. Start a club with signup sheets at your local pet stores. Generating Grass Roots Support Visit with dog trainers, dog club members, and the people you meet at the local pet store or at your veterinarian's office.
Interest can be everywhere.
Preparing a petition and collecting signatures has worked for some groups.