...a lawsuit recently filed in Miami federal court is now questioning what unexpected ingredients may make it into your pet's food.

The 150-page lawsuit targets more than a dozen major pet food companies and retailers, and claims that the companies have used false and misleading advertising.

Photos found in the lawsuit filings are graphic. They show dead cats dumped into trash cans and bones of dead animals at a rendering plant.

Attorneys claim that many companies try to save money by intentionally putting dead and diseased animals into your pet's food. MacIvor showed the CBS4 I-team a photo of dog food containing hair and sutures.

But MacIvor said she found also found evidence of, "Hair, hooves, spine, hair, fetuses of cows, dead and diseased animals."

MacIvor cited an investigative report from a television station in St. Louis in which a truck is followed as it takes euthanized cats and dogs from a Missouri humane society. The animals are allegedly ground up at a rendering plant, and then used as additives for pet food.

The truck allegedly carrying the animal parts reads "serving the pet food industry."

According to the FDA, there are traces of pentobarbitol, a chemical used to euthanize cats and dogs, in pet food. MacIvor explained the FDA has not outlawed the practice, and said it's common.

The lawsuit also claims that when many animals eat commercial pet
foods, they can get allergies, kidney problems and illnesses. It also raises the claim that if pet food was better regulated, there wouldn't be as many sick pets and deadly product recalls.