so you're saying that ALL those managers lied!!!!!A bit of google'ing. "Petco franchise"
http://www.petco.com/content/contactsubtopic.aspx?PC=contactcompany
Now click on question 7 to get the answer..
7. Can I own a Petco franchise?
At this time, Petco stores are company owned and operated. Unfortunately, there are no franchise opportunities available. We appreciate your interest in Petco.