A pet food maker Wednesday recalled some of its dog food sold exclusively at Wal-Mart Stores Inc. because of concerns about possible salmonella contamination.

The recall issued by Brentwood, Tenn.-based Doane Pet Care Co. is unrelated to recent pet food recalls connected to tainted Chinese proteins used in some pet food production.

Only a single batch of 55-pound bags of Ol' Roy Complete Nutrition dog food is being recalled. The dog food was produced at a plant in Manassas and distributed to 69 Wal-Mart stores in Virginia, West Virginia, Maryland, Pennsylvania, North Carolina and Ohio. Forty of the stores are in Virginia.

The company recalled the dog food after the Food and Drug Administration detected the presence of salmonella. People handling the food could potentially be exposed to the bacteria, along with pets that eat the food. The company said no illnesses have been reported.

Affected bags have the code 04 0735 1 and a "best by" date of April 13, 2008.

Doane Pet Care is a division of the privately held, McLean-based Mars Inc. manufacturer of candy and pet foods.

Consumers with questions can call 800-624-7387 or find further information at www.doanepetcare.com