Usually ingredients are listed but NOT the toxic chemicals used in the processing of the treat or food.
I did not base my research on 1 article. I found the toxic ingredients on many professional & non-professional websites.
Hopefully people really check out what they are feeding their pets.
40 years of having dogs I assumed all were tested and safe. Most treats are not. I found my research also pertained to some pigs ears, some bully sticks and other treats. Speaking for myself, I wish I had researched and not just assumed everything is safe. Also check out the country from which the item comes from. Sometimes the item is ONLY packaged in the USA, but actually made in another country.
Hope this info can be of help to all.
