I had tryed adding a few pieces of this to the dogs homemade & they all got constipated. Just a heads up,they are adding rpc to it now. It wasn't in the bags my neighbor had with exp before 6/08,but its in the 2 newer bags we both got.I stopped using it.

((Leslie, Petslave))) THANK YOU!!! This had to be it...I have been banging my head into the wall he had een doing really well for a long time now..Nothing changed with his food or so  I thought till you brought this up..We check the bags each time we buy for any new ingredient because he is allergic to soooooo many things...Hubby looks at the bags and didn't remember when we tossed all the cat foods with RPC due to the *other issue*...BUT YES, PROTEIN is what allergies are based on ..I had my husband look on this bag after I read this and yep it was there RICE PROTEIN CONCENTRATE...was added 
I think before hubby just saw rice and kept reading at the store. We do not give him a lot of kibble but I do for the vitamins as even the made in the USA ones DO source the c and b now...Well I will be changing foods..Its a shame they added the RPC because to me ..IMHO that means they use less meat for protein and more RPC ...I WANTED  AND NEED ONE protein and ONE carb source .....this makes me mad       
BLESS YOU FOR CATCHING THIS FOR ME now my dog can move on and heal and I won't have to work so hard at trying to find what his newest trigger was

Exactly Petslave ...it's like a little lightbulb went on over my head when I read rPc  .....I have a medical background (human) and thus connected the dots ..protein...Even when they were boosting the protein  content of foods with non-food items...it never hit me to add in the allergy connection...all I thought was run its poisen ..Many people do not realize that even latex has protein and THAT is what people are really allergic too...This was such a brillant string of posts in here and saved me a few grey hairs ..OK a few more