My vet gave all my cats the metronidazole for giardia. However, he gave them all 1ml only 1 time a day. Is this right??? My dog once had a bloody stool and my vet treated for giardia as a precaution and his med was twice a day. Is this normal or should I call the vet? Maybe he is under dosing the cats? The babies weigh about 6-7 pounds. Blue is more like 9-10 pounds. They are all on the same dose.