The Food and Drug administration has warned owners not buy Merrick Beef Filet Squares after tests turned up positive for salmonella, which can sicken both people and pets.

The agency, which took the unusual step of issuing a recall notice itself rather than relying on the company, said the potentially contaminated treats were sold nationwide by Merrick Pet Care, based in Amarillo, Texas. The suspect squares are marked “Best By 111911.”

No known illnesses have been reported.

The FDA said routine testing turned up salmonella in December. A follow-up inspection of the company’s plant found faulty packaging and manufacturing processes.

The FDA said consumers should wash their hands having contact with the treats and to throw them way in a covered trash bin.