Tripe is NOT essential to the diet. It's a good food but not absolutely necessary.
What type of tripe and offal are you feeding? Ask the farmer what he has been feeding those animals. If he is feeding them high amounts of grains and your dog is very susceptible to grains then that might be the problem.
You could tripe and liver/kidneys from a different protein source, or even a different farm, to see if it makes a difference.
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