I assume you are talking about Diamond Naturals. My opinion is it is an average food. All dogs are different, so your dog may or may not do okay on it.
If your dog is reacting to something in the food, it is most likely a grain. If it isn't a grain, it could be the protien source, in this case chicken. If it was my dog, I would do the following:
1. Put the dog on a high quality grain free food that does not have chicken as the protien source.
2. Supplement with plain yogurt and canned pure pumpkin.
3. Give the dog a couple months on the new food and see if the issue has resolved.
If the new, high quality food corrects the issue, you know that the Loyall was the issue. At that point, you could look at different foods if you are looking to find something more affordable, as grain frees are expensive. I would recommend any of the following foods:
Fromm Grain Free (made in Wisconsin. Fromm also produces another brand name that is less expensive that also is grain free, but I can't recall the name.)
Taste of the Wild
When picking a grain free, be cognizant of the the protien/fat contents. Some of them go sky high in the protien department, and unless your dog is an extreme athlete, the super high protien levels are not required. This is again one of the reasons why I feed Taste of the Wild Pacific Stream Formula, as it is one of the more affordable grain free foods, has a reasonable protien level, and is available at two different places in the town I work (Tractor Supply sells it).
[This post was last edited on 12/29/11 at 1:02 PM]