Bloomberg Markets with Carol Massar and Cory Johnson.\u0010\u0010GUEST:\u0010David Wilson\u0010Stocks Editor\u0010Bloomberg News\u0010Discussing his "Stock of the Day" PetMed Express (PETS). PetMed Express Inc.'s shares may be headed for their biggest one-day loss in almost four years. The online seller of pet medications now faces competition from PetSmart, which opened an online pharmacy on its website. PetSmart is owned by a group of private-equity firms, led by BC Partners.

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