Seven years after it was first filed, an Illinois district court judge has granted, in part, a motion for class certification in a claim brought by pet owners against Hill’s Pet Nutrition over the fact that the company requires a veterinarian’s prescription to purchase its Prescription Diet food.

The plaintiff’s second amended complaint was filed in U.S. District Court for the Northern District of Illinois, Eastern Division in Holly Blaine Vanzant v. Hill’s Pet Nutrition. In it, the plaintiffs alleged deceptive practices claims over the requirement that Prescription Diet (PD) be sold by prescription. The claim further alleged that the deception allowed both Hill’s and PetSmart to sell PD at above market prices even though the product does not contain any drug, medicine, or other ingredient that prevents disease, according to the opinion.