My baby girl did 10 days on antibiodic for Giarrdia....took new sample in yesterday...SHE STILL HAS IT!! Uggh.  Poor baby girl.  Poor me too, she can't hold the runs in the house and I have cleaned up after her numerous times!  She doesn't signal that she needs to go out...so she slips up if we aren't paying attention.  So now onto round 2 with meds.  2X per day now for 10 days.  I hope this takes care of it.  Anyone else ever have to double rounds of meds for this to clear up? I'm so worried that it is in the yard from the rabbits/deer.  She likes to eat their you know what!  Doc thinks she may have gotten from the puppy mill she was rescued from, but my old dog had it once too..hmm.

I would highly recommend giving probiotics after giving that much antibiotics.   For the giardia,  Panacur is said by some to more effective than antibiotics.  The recommended dosage is:  

"I have been told by several vets, the best course is to use Panacur for 3 days and repeat it again in 2 weeks, taking the same 3 day dosage and dividing it up over 10 days to get it at all stages of the cycle. I have recently read that Flagyll and Metronidazole are only 40% effective any more, so discuss this with your vet and ask about the use of Panacur."

The complete link is   http://www.greatdanelady.com/articles/giardia_protozoa_diarrhea_vomiting_weight-loss..htm

Wow...if this doesn't work, I'll mention what you said about the other drug.  We have to pay $27 for each new stool sample!  No biggie I guess, just want her to get better, but I wish they would do it for free after so many!  Yeah right huh?

 Where do you live?  We are in IL near Chicago.  My vet had said he doesn't see it all that much around here.  But like I said my last dog had it too, so I wonder...  Oreo has had probably since she came home or shortly thereafter.  We've had her a little over a month now.

THanks for your help.

Sounds like you have a great vet.  I should probably say something to ours about having to pay each time.  You never know unless you ask, maybe they won't charge for the next one coming up.