Of course you may try another food. Usually existing ailments will decrease more or less because the composition of ingredients differ (e.g. less protein). Still the question remains whether this other food meets the need of nutrients of your dog. If this is not the case, after a while ailments will arise all over again.
With a good basic food supplemented with HOKAMIX you can be sure that the food is well adjusted to the body and nutrient requirement of your dog.