Arkansas ? The U.S. Food and Drug Administration said Wednesday it was checking dog treats recently pulled from Wal-Mart’s shelves but had not yet detected any chemical or biological contamination in the Chinese-made products.

Meanwhile, a spokeswoman for Wal-Mart Stores Inc. said the world’s largest retailer was aware of other companies selling the suspect products to pet owners.

Bentonville-based Wal-Mart said this week it had stopped selling Chicken Jerky Strips from Import-Pingyang Pet Product Co. and Chicken Jerky from Shanghai Bestro Trading in July, after customers said the products sickened their pets.

Wal-Mart said 17 tests showed trace levels of melamine, the same pesticide byproduct that led to a widespread pet food recall in March after an unknown number of dogs and cats died.