Hi, sorry for the delay in responding;
Pigs' ears have a high fat content and can lead to obesity, can also cause stomach upset in some dogs, they are high in fat, they can irritate the pancreas, causing pancreatitis in susceptible dogs. This results in vomiting, lethargy, abdominal pain and diarrhea.
Pig's ear treats can also be a source of Salmonella bacteria. The federal government recently issued a warning that pig's ear dog treats from a number of manufacturers were contaminated with Salmonella bacteria, which can cause diarrhea, nausea, vomiting, abdominal pain and other serious long-term complications. Some pets that become infected may not show clinical signs.
. Better yet, avoid them altogether.
www my-dog.info/dogs_and_food/pigs_ears.asp