Our dog (older female GSD) is food sensitive and we settled on Acana Singles. She has well controlled medical issues and is under regular veterinary care including annual blood/urine/stool analysis. Her lab results have been consistently excellent for the last 3 years.
There is no good answer to your question as to the best product. That really depends on your dogs needs.
You need to do a lot of work in researching your dogs specific dietary requirements. Hopefully your vet is very diet aware and if so he/she can be a real help in finding the right food. We are lucky as our vet does a lot of work with local police departments for their K-9 animals and is considered an expert on these breeds (GSD, Belgian Malinois, etc).
