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Almost every large box pet store hosts training classes of some kind.  Most of them are basic Dog Training classes, but sometimes they do have advances classes.  In larger metro areas there are private dog classes that you can sign up just like you might sign up for a class through the local parks and recreation.  In order to take these classes, you must be sure that your dog will behave well around other dogs.  If you have difficulty controlling your dog around other dogs, you may not be allowed to attend in order to protect the safety of other dogs in the class.  The best way to be sure your dog will respond well is to start socializing it early.  Spend some time in a dog park if there is one nearby.  If not, going for frequent walks where your dog will see other dogs and learn they are not a threat is a good alternative.