Stockholders today approved the acquisition of Petco Animal Supplies by private equity investment firms Texas Pacific Group and Leonard Green & Partners for $29 per share.

The $1.8 billion deal, including the assumption of $120 million in debt, is expected to close this week.

The two investment firms had previously taken Petco private in 2000 and then public in 2002, eventually earning a 600 percent profit on the deal when they finally cashed out completely in 2004.