Is it the RC sensitivity control kibble? We had to give Willow that as during puppyhood she was often passing very sloppy muccusy stools and sometimes it contained blood. She was on that food for about 4 or 5 months at a guess and her poops firmed up nicely. we were then able to re introduce her onto another food and touch wood since sept/oct time she had been fine.
We were not sure which food triggered it so when we first put her on this food we didnt give her anything else, once her tum was fine we began re introducing other foods back into her diet.
Where are you getting your food from I find viovets a good web site and cheaper than buying at the vets.
