Pet treat company Hartz Mountain Corp. is voluntarily recalling all of its Hartz Chicken Chews and Hartz Oinkies Pig Skin Twists wrapped with chicken for dogs in the US because the products contain unapproved antibiotic residue.

Recent testing by Hartz and the New York State Department of Agriculture and Markets found trace amounts of unapproved antibiotic residue in samples of Hartz Chicken Chews and Oinkies Pig Skin Twists wrapped with chicken products. The antibiotics found are among those approved for use in poultry in China and other countries, but are not approved for use in the US.

According to the company, a review of the test results by the Food and Drug Administration found that Hartz’s recalled products are highly unlikely to be related to the ongoing reports of illnesses linked to chicken jerky pet treats. No known illnesses associated with the products have been reported.

Consumers who have purchased the products should contact Hartz Consumer Affairs team at +1.800.275.1414.