Washington (AP) The head of the company at the center of a massive pet food recall says the firm can't explain why some cats and dogs have developed acute kidney failure and died.
At least 16 animal deaths -- 15 cats and one dog -- led to the recall of 60 million cans and pouches of pet food sold throughout North America under 95 brand names. Menu Foods President Paul Henderson calls the deaths ``a puzzling and troubling experience.'' He says the food shows no sign of contamination.
Henderson tells the Associated Press that his company is looking at a single ingredient, but wouldn't identify it.
The Food and Drug Administration has said the investigation is focusing on wheat gluten, a source of protein and a thickener. The FDA says wheat gluten itself would not cause kidney failure, but could have been contaminated by heavy metals or mold toxins.