Well having just went back to work part time at Petco for easy money I can tell you, it was the worst "interview" I've ever had. They didn't ask anything about my past employment, and all the manager did was basically talk about himself and his fish. It was not proffesional by ANY means, but I got the job. I thought they would have cared to to ask basic questions, such as past employment history, what your strengths and weeknesses are etc. NOPE! The guy was pretty much falling asleep while talking to me....

Just be yourself and be honest. Tell them why you want the job, because you love pets and love educating others on proper pet care. Let them know you are excited to learn sales, and be friendly and in high spirits. Good luck!