[Rae Rae]

I would assume its the same concept as plastic surgery doctors that advertise. If something is really good, the business gets spread through word of mouth, therefore it's best to avoid plastic surgeons w/ commercials and advertisements. Maybe it's the same with dog food. If it's really good, name spreads through word of mouth. If it's bad though, people won't talk about it, therefore they need to advertise to get the name out there