All professional animal trainers with an emphasis on dog trainers & dog owners.
The first group is a varied market, but is composed of primarily women. I would say there are two categories. The people who have been doing this for a long time tend to be older women (perhaps retired, or financially secure) who have been dog fanciers for a long time; most of them do not work full time at their business. However, there is a new group coming in which tends to be younger women coming out of college with a degree in behavior or psychology who are looking for a career in training.
This is a group that is hungry for education and is willing to spend money on education, although they don't make a lot of money. I want to focus on those who are looking for a full time career, working toward or have achieved certification, and are interested in turning this industry into a respected profession.
The owner group is huge so I've decided to define my own target market: Gen X, double income, no kids, college educated, $50K+.