Quote Originally Posted by dragondawg
The only time a dog will display diarrhea as a result of stress is if the stress has resulted in illness.
While I agree with the rest of your statements, I don't agree with this. I worked in a kennel, and a lot of dogs would have diarrhea because of the stress of being in a situation like that. Bloody diarrhea, sometimes is stress related and other times not. If it is indeed parasites, then yes it can result in the diarrhea. One round of worming dosen't always take away all of the worms.