Hill’s Pet Nutrition announced this week that it expanded its voluntary recall of dog food to include 33 varieties because the food included elevated levels of vitamin D. The affected products include some canned dog food that was sold at pet stores and veterinary clinics around the country. It does not involve dry food, cat food or treats, according to a press release from Hill’s Pet Nutrition. The recall was caused by the same vitamin mix from an American supplier that caused the previous Jan.