(WSIL) — A treat for dogs could be making their owners sick, according to the Centers for Disease Control and Prevention (CDC).

Researchers at the CDC are investigating the cases of 45 people who have been infected with salmonella.

45 people in 13 states have been diagnosed with the illness, including 3 in Illinois and 3 in Missouri. 12 people have been hospitalized but no one has died.

Officials said 34 people who have been diagnosed with salmonella had contact with a dog before they got sick. Of that group, 17 had contact with pig ear dog treats or were in contact with dogs that had received the treats.

No common supplier has been identified.

The CDC has some safety tips to help you stay healthy while feeding your pet: