Tara said in rec.pets.dogs.health:

Did the Panacur ultimately do the trick for Rocky?

Rocky's giardia symptoms kept reoccurring, so I finally
contacted a research vet at the U of Calgary (the vet who
developed the giardia vaccine a few years ago). He said that
since the broader-spectrum metronidazole wasn't working, to try
Panacur for two successive treatment periods. That cleared it
up.

--
--Matt. Rocky's a Dog.