The Food and Drug Administration collected some pet food from Sportmix after at least 28 dogs died and eight others fell ill due to products with high levels of toxic fungi.
The agency warned pet owners and animal experts on Wednesday that certain varieties of the brand’s feed “may contain potentially fatal levels of aflatoxin”.
Aflatoxin is a fungus that can grow on corn and other grains used in pet food, the agency said.
Symptoms of aflatoxin poisoning include sluggishness, loss of appetite, diarrhea and vomiting, the agency said.
Pet owners whose animals ate the recalled Sportmix products – listed on the FDA website – should contact their veterinarians.
The FDA said it is working with the Missouri Department of Agriculture to determine whether additional products are also potentially harmful.
“While this pet food recall is still ongoing, we are sharing the facts we have so far because the levels of aflatoxin found in the collected pet food are potentially fatal,” Dr. Amber McCoig, deputy director of the FDA’s Center for Veterinary Medicine Division of Compliance said in a statement.