Canned Fish ?

Further to my previous post , I now think that canned fish is really good for dogs - As soon as I put some in her food, she goes crazy for it! I've been feeding her fish now for a couple of weeks, and her coat is amazing and shiny - possibly the oils? Its got to be better than factory produced dog food - I mean , lets be honest - we have no real idea whats going into their processed food . I think we can be sure its not top quality cuts of meat! Any thoughts?