I think Acana is from the same company as Orijen and thats what I have had awesome success with.
Have you only tried the fish? I would start out with something like chicken and if he is good on it introduce another protein source if you like. Maybe the fish is too much for him.
I use pumpkin for either diarrea or constipation (it works either way) and it must be the pumpkin that is pure not the pumpkin pie filling.
I assume you have ruled out medical / gastrointestinal issues?
Tabitha April 10, 1995
Bomber April 10, 1995 - Received his wings July 12, 2010
Winston Nov 15, 1999 - Received his wings September 15, 2011
Sophie Aug 30, 2011
"UNTIL ONE HAS LOVED AN ANIMAL, PART OF THEIR SOUL REMAINS UNAWAKENED"
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion.