A dog food company has issued a nationwide recall after some samples tested positive for the euthanasia drug pentobarbital.

Party Animal said in a recent news release that it is recalling two lots of its Cocolicious dog food after a Texas retailer said a customer had brought samples of the food to a testing lab, which detected the drug.

The affected products, manufactured in 2015, include 13-ounce cans of Cocolicious Beef & Turkey dog food (Lot #0136E15204 04, best by July 2019) and Cocolicious Chicken & Beef dog food (Lot #0134E15 237 13, best by August 2019).

"The safety of pets is and always will be our first priority," Party Animal said in a statement. "We sincerely regret the reports of the discomfort experienced by the pet who consumed this food."

Customers who have the recalled products "should return them to the place of purchase and will of course receive a full refund," the company said.

"Party Animal wishes to emphasize that we have submitted many recent lots of our beef flavors for testing and all have tested negative for any pentobarbital," the company added. "We have also had extensive discussions with our manufacturer regarding the potential cause of the reported contamination of the 2015 lots, and we will continue with such discussions even as we await testing results for the 2015 lots. In order to ensure adherence to our commitment to the safety of pets, we are also actively re-examining our manufacturing processes."