Were you able to return to the vet for a repeat fecal exam today?
And, yes, pets can suffer from IBS as well.
Boxers DO have temperamental stomachs and often need a food that is free of fillers and additives. Your vet can help you pick a food that will benefit your pet.
If you recently changed her food or gave table scraps, the diarrhea and irritation is all part of the intestinal adjustments that must take place.
Let me know if you still have questions.