Yes, do some research at the Dog Food Advisor site. Generally, cheaper is poorer quality. When you think about it, that makes sense - the only way to charge less is to use cheaper ingredients.
You are definitely right about Facebook. As far as I'm concerned the Masters of the Universe are going to have to take over the world without my help, which makes me inclined to forget how into it most of the rest of said world is. And probably right about tv, as all I have is network, which I watch maybe an hour a day on average, although there's as much advertising as programming. Chewy.com definitely must have a huge advertising budget because they blanket the stations I watch, but that's promoting their online sales, not a particular dog food. For that all I've seen is the one company, whose campaign can't be too effective because I can't remember the name, just that it's supposed to be fresh food. Name definitely isn't memorable.You must not watch much TV, then, and aren't on Facebook. There is a TON of advertising out there.