Hi,
I've never heard of Pollock, but with anything in life. If it's too good to be true, it usually is. I would spend a little more money and buy a dog food in which I will now for a fact is actually good for my dog. Have you tried feeiding your dog a natural dog food? If not, you should check out
NaturalK9supplies and check out the variety of natural dog foods out there.
The one I currently feed my Yorkie is Acana, made by Champion Pet Food, and they also make the Dog Food of the year (2009), Orijen, but that one for my dog was too high on protein.
You should definitley check them out, they also have the lowest prices on the web.
Hope this helped.