Hi, I'm not sure of the amount of fibre in the foods, but it may not be the fibre that is the problem, but the Pea or Pea Protein. My guys did not tolerate Pork and Peas either, they had soft serve poops. We just switched them to the Lamb and Lentil a little more than a month ago, and they are doing well on it so far. You can try the Lamb and Lentil, and see how he does, the great thing about Fromm's foods, is that you can switch between flavours without having to do a slow transition. You can ask your where you buy your pet food, if they can give you a couple of sample bags to try, and see if he likes it. ( That's what I did ), and also most stores will take back an opened bag of food, as long as its not less than half full, and will exchange it for another bag of food. You can also donate opened bags of food your dog doesn't like or tolerate and give it to a rescue agency or the SPCA, they are always looking for donations of food and other supplies like paper towels, blankets, wipes, toys, leashes etc.