Petco offers pet services 'from head to tail' in every department, from dog obedience training to veterinary care. Excellent customer service is a vital component to the success of every department. If you have experience in the retail industry, walk the interviewer through your previous jobs and be sure to highlight your favorite and most challenging positions. If you don't have any retail experience, that's okay! You have likely gained the skills and experience needed to make customers happy through your professional and personal relationships -- and you can let the interviewer know that you are excited to make the transition to retail and learn more about the industry.