Forty-five people in 13 states have reported becoming ill with a strain of Salmonella, many of whom after giving their dogs pig ear dog treats since November, the CDC reported.

Of the 45 people sickened, 12 were hospitalized. Of those interviewed, 71 percent reported contact with pig ear dog treats or with dogs who were fed pig ear dog treats.

The report did not contain a recall, but some pig ear treats have been pulled from shelves.

The CDC said that the Michigan Department of Agriculture tested pig ears for salmonella. Although the outbreak strain of salmonella was not found in the pig ears, of strains were. The CDC said that investigators are checking to see if the pig ears tested were responsible for the illnesses.

In the meantime, the CDC offers the following advice: