PetSmart said it will join rival Petco and stop selling dog and cat treats made in China because of ongoing fears that the treats are making pets sick.

Investigators at the U.S. Food and Drug Administration haven't been able to prove that treats made in China are making pets ill. But since 2007, the agency has received more than 4,800 complaints of pet illnesses and more than 1,000 reports of dog deaths after eating Chinese-made chicken, duck or sweet potato jerky treats.

PetSmart Inc., which runs more than 1,300 stores, plans to have the treats off of its shelves by March 2015.

Spokeswoman Michelle Friedman said Wednesday that the "vast majority" of treats sold in its stores are not made ...