We have had our dogs on the new grain free fish dry dog food available at Costco now for almost two months.
I highly recommend this food Costco gets if from a company named Pelican Bay you can Google them and read about the food.
We have a dog with allergies and have been feeding him a very expensive fish diet hard food as it was the only one we found that he did not have issues with.
We cut him over slowly to the new food as we wanted to make sure there were no issues. I am very happy to report that he has done very well with the new food as are all of our dogs.
There coats are very shiny and we have not had issues with gas (well our Boston but that is the nature of the breed very similar to Bull Dogs).
If you prefer grain free diets you may want to give it a try as it is a fraction of the cost of many others.