I have heard the same but most dogs get sick eating salmon. Maybe the people's dogs developed immunities?Strays. There's strays in every river. Why wouldn't there be pinks in Oregon? They were here at some point. Dog salmon I believe were named such because people didnt want to eat them and they were primarily fed to dogs. I heard that somewhere a long time ago. Don't hold me to it. I have no proof, and to research it in depth on my phone.