My sister has worked as a vet tech for 8 years and says that they see at least one dog a week for a abstruction or infection caused by rawhide, pig ears or cow hoves. She said the problem is rawhide swells. Also when they process pigs at the slauter house they throw the ears in a big bin. They get around to preparing them when ever they get a chance. There are no FDA rules on pig ears for animal consumption. Also cow hoves splinter and cut up the animals intestants. She says that if you want to give your dog something to chew on get compressed rawhide. They are kind of exspensive but, cheaper than a $3000 vet bill. I can't swear she's right but, I perfer to weigh on the side of caution.