This guy might be right....but it'd be a lot more credible if it didn't descend into one giant sales pitch. In my personal experience, people who use scare tactics to market their products are usually scam artists. I remember my wife got this thing in the mail about a free vacation or something if you went to their seminar, I was sure it was a scam but we went just for curiosity. Turns out the guy spoke for an hour about how the pots and pans everyone uses to cook their food are toxic and poisoning us. So what did he want....that's right, buy THEIR stuff. Most people walked out laughing but ya know what, a few people were buying their crap.
I went home and researched it, total scam artists with a shady past.
With that being said, I do agree that dog food is most likely filled with all sorts of crap. The thing is you just don't know whats in there. That's why I switched to raw. But I'm overly paranoid to begin with.