Those with kennels can add dog runs for boarding and training. Some trainers go into grooming, dog handling, and showing dogs. Although trainers work with all kinds of dogs, some specialize. They may raise pups, train and show one or two breeds. Some acquire a national reputation.
Trainers also develop their connections locally.
They work with local police departments and trainers and advisors. They may give free lessons. They speak before humane groups, business groups, or civic groups. They may work with veterinarians who have difficult patients. Some trainers go on to become veterinarians.