Your mom's concerned about your future, that's all. What you need to do is show her that there is a future in dogs for you. You could go into dog training and grooming as a career, veterinary medicine, or any number of other perfectly reasonable canine-related fields that don't have to be low-paying. Is there a local animal shelter or veterinary clinic where you could volunteer on a weekly basis? This will help you meet the people doing this kind of work and give you a better idea of what kinds of careers are out there for a young person interested in dogs.