So Theo will be ok for a week or 10 days, then boom we are back to having diarrhea or mucus/with a bit of blood. The vet just called me and we spoke for about an hour on the phone. She really wants me to give Theo a dewormer. Told me that even if we did an endoscopy on him any specialist would first ask with all his symptoms that he has, if he was dewormed. She said we should do this next. If that doesn't work, she will try metronidazole again, and then would like to try Theo on a home cooked recipe to see if he is allergic to the food he is eating. Said something about starting with one protein and one carbohydrate. Not sure how that works but anyways..Just wondering what you all think? The vet said the worst thing that would happen is that the dewormer would cause loose stools. I was really against it but after talking with her for all this time I am thinking she is right and that I should give him a dewormer, even if its tests came back negative for parasites. She said that Giardia only shows up 60% of the time and that tests can be negative and the dog does actually have Giardia. Just wondering what you all think about this next step?