Is there one site that can tell me the pro's and con's of most of the popular dog foods?
thanks

Yea, Champdogs :D

Seriously though if you mean is there an independent body that tests and compares and publishes results then no I doubt there is, who would fund it?  But if you are looking for opinions then if you do a search on Champdogs for any food you care to name :) then I am sure you will find plenty of opinion, trouble is you will find pros and cons for any food to care to name :) so the best thing is to take advise from someone you trust such as the breeder of your dog and see how it goes.

Thanks for that.Both my dogs are rescue dogs so i don't have a breeder to ask so i will try the search out