Just wondering I just discovered after trying ds on pineapple for the first time that his body doesn't agree with it he gets really cranky feels unwell and has pineapple smelling diarrhea until it is completely out of his system

I gave him some juice the other day (which had 6% of pineapple juice in it) he then got those symptoms again as well as vomiting his dinner that he had with it (but that was it) and fevers for the next 24 hrs and diarrhea no other symptoms so much like his other reactions ... Can intolerance reactions cause fevers ??