Well, I guess I would want my vet to test rather than go by symptoms. Your pups had diarrhea for over 6 weeks...that's a long time. I did not suggest that you should deworm a sick animal btw. :confused:

In greater detail and testing that was done:

In March I treated them with metronidazole from my vet the last time this happened... one 5 day tx (diarrhea stopped), skipped 2 days diarrhea returned, continued Metronidazole for 3 more days (diarrhea stopped), diarrhea returned after two days, then a 10 day tx which stopped the diarrhea, added a bland diet, but it started again after being off the Metronidazole for 2 days.

I then, on 04/01/13, took Tinkerbell and Peek A Boo in for a check up. They both got an extensive exam, a fecal exam, bloodwork, and Tink got an abdominal xrays. All results were within normal limits/neg, except Peek A Boo, who was found to be in early stage kidney failure. Both went home on Sulfasalazine and Proviable (dietary supplement: probiotics). ($473.58)

On 04/04/13, I took Infinity and Sapphire in for their check up. They both had exams and fecals done/neg. The vet did not feel it was necesary at this time to do BW or Xrays on either of them They went home on Sulfasalazine, and she put everyone (including Tink and Peek) on ProPectalin (to stop the diarrhea).
($243.88)

On 04/23/13, I called, spoke with the vet, and got a prescription for Panacur filled, and started them all on it the same night. 3rd dose is tonight, and repeat in two weeks.
($56.00)

ETA: 2 days off the Sulfasalazine and the diarrhea came back (the diarrhea did stop while they were taking the Sulfasalazine), so called the vet to ask about Panacur.

I hope that the Panacur works. I can imagine how terrible it is to have 4 of them sick. I will keep them in my prayers!

Wow what an ordeal! I'm glad you found the culprit & they're being treated now...hope everything will turn out ok, cleaning 4 fur butts is a lot of work loll!

Another thing that my vet usually offers me for a pup with diarrhea and I always go for is an injection of chlopromazine...that stuff is amazing and stops the diarrhea within 12 hours! She ,of course, treats the cause but at least the symptoms are gone before the cause is!