My two puppies were diagnosed with Giardia at approximately 3 months of age. We have already received Metronidazole, and resubmitted fecal samples again. And at 4 months they still have the same diagnosis. Im so concerned, and would like to know how to get rid of this once n for all. Online chats have said there is an injection that they can receive to help cure this. Is this true? Please let me know what other options i can bring up to my vet. THank you so much for your time.