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You're not going to make it in the pet photography business if you don't truly love what you do. Over the years in your business, stay passionate. Remind yourself of the things you like about animals, even in moments when animals are being frustrating.  For example, if you're working with a timid dog, empathize. If the dog came from an abusive background, remember this. Also, pets do not live as long as people. Your clients will treasure the pictures you take of this animal after it's gone, so work hard to get some successful photos. You never know when clients may be available, so maintaining a flexible schedule can help you land more clients. Be willing to do last minute shoots. Clients may want photographs of an animal that's going to be put to sleep, for example, so be willing to dedicate your Saturday afternoon to an emergency photo shoot. Working with animals is an ongoing process, so continue your education as you get more involved in the business. Take additional classes in animal training and behavior and learn from your own experiences. If there are any certification classes you can take in animal training, enroll in them. A broader skill set can attract more clients. Broaden your experience to working with different types of animals. Advertise in pet stores that sell things like reptiles or tack shops so you can work with horses or livestock. In addition to building your skills working with animals, learn more about photography as you build your business. Take photography classes or use online tutorials to learn things like editing, lighting, and other technical skills. The more you know about photography, the happier your clients will be with your work. As your business grows, you may find you can't keep up with everything yourself. In the future, you may need to hire employees to help with things like set up, scheduling, and editing. Hire employees as necessary to keep up with the increasing demands of your business. If you don't have business experience, consult a lawyer or accountant to help you fill out any necessary documents for hiring employees.
Stay patient and enthusiastic working with animals. Keep your schedule flexible. Continue to develop your animal skills. Widen your photography skill set. Hire employees if it becomes necessary.