IOWA CITY, Iowa (AP) — Iowa regulators say they are investigating whether the death of a racing dog is linked to the use of a performance-enhancing drug found in others in the same kennel. Administrator Brian Ohorilko of the Iowa Racing and Gaming Commission says the dog from the Iowa Greyhound Park in Dubuque died at a veterinarian’s office Wednesday night.

He says the dog isn’t among those that have already tested positive for ractopamine, a drug widely used as a feed supplement for livestock. But he says the dog came from one of the two kennels that are under investigation. The animal’s carcass is being sent to Iowa State University for a necropsy. Two trainers and two kennels have been temporarily suspended as regulators investigate how dogs ended up with the banned substance.