It could be another blow to Chinese imports.
Wal-Mart quietly stopped selling two brands of dog treats after customers complained the treats sickened their dogs, but it hasn't announced a recall.
A company spokeswoman says the treats are being tested.
The world's largest retailer started pulling two types of chicken jerky from two different Chinese importers in late July. It also placed a computerized block on all cash registers to prevent workers from selling the products.
Wal-Mart's action follows a massive pet food recall in March, when retailers began pulling products made in China that included the chemical melamine, a byproduct of several pesticides.
Philadelphia television station WPVI reports that a woman claims her 2-year-old Chihuahua died after eating the dog treats. An autopsy revealed that the dog died of an infection caused by toxic bacteria.