
Teri,
If you believe that supplementing a complete commercial food is bad, then why would you then recommend switching a meal of complete for a meal of oily fish? It's potentially "upsetting the balance" and you are adding oil from the fish as well, just curious as you seem to have contradicted your own advice.

BTW, on the Burns web site you will find that they acknowledge that sometimes their food does need to be supplemented.
Any complete food can be supplemented without worrying about upsetting anything, as long as you are doing so for a specific purpose (dog needs more protein, or more oil, or more fibre). Supplementing is also fine and balanced if you supplement with another complete meal (homemade or commercial).
When the heat goes on in the winter my two dogs usually do a bit more scratching then usual, so I add a bit of Evening Primrose oil to their diets, which takes care of the problem. It's a lot easier than switching to a different brand or variety with a higher percentage of oil, which generally means higher levels of other ingredients (like protein) as well. (I also find my own skin goes dry as well, so as I get more than enough fat :rolleyes: I start slathering on the lotion after my shower!)
Supplementing just for the sake of it I'd agree is not useful. Plus, if I personally found that a dog food did not agree with my dogs unless I had to supplement, I'd probably switch brands or varieties.