I picked up at a pig-ear factory in Denver one time. It's no wonder to me why there is trouble with these dog treats. There is little regulation over dog treats, so refrigeration isn't as strict. That place reeked of rotten meat! AJ can't eat pork or rawhide. He gets sick from them every time.
Also, the hooves that are used for treats sometimes lay in the field for a few days attached to a dead cow before they are processed. It's nasty!