Your Corgi is beautiful and that picture is great. As for what might have happened. Do you still have the packaging the pigs ear came in? If so check to see where it was actually from. There has been any number of health issues related to dried meat products imported from China. I don't know if that is the case here but we have 7 dogs and we used to give them chicken jerky which they loved until we read about an outbreak of Salmonella directly related to imported Chinese chicken jerky treats. We now have the policy that absolutely nothing from China goes anywhere near our dogs and we also now do only health treats that we can make or prepare ourselves. We started this entire sustainability thing to improve the quality of food we ate...why should we not extend the same consideration to our pets?