Cow ears would be processed the same way that pigs ears are.
Maybe this article will help: http://www.embracepetinsurance.com/blog/harmful-side-animal-sourced-dog-chews excerpt below, click on link to view full article.
•Cow hooves and pigs ears are what the name implies.
•Marrow bones are from the long bones of cows and pigs.
•Rawhides are the skin of cows.
•Antlers come from either deer or elk.
•So what do you think bully sticks are? Think about this one. Give up? They are bull penises! Hmm.
There are some dangers with all of these items. All of these have the potential and can cause intestinal obstructions, but equally important are the dangers that come from the way these are processed. They are first soaked for hours in a caustic lye solution to digest the undesirables off the skin and then to remove the lye the skin is then soaked in bleach solution. Sounds yummy. Many of the rawhides come from China where they have been known to use arsenic compounds to preserve them.
There is no regulation of rawhides or pigs ears. You really have no idea where these come from.
