Jill, About a year ago, I first got giardia in my shelter. I don't know who brought it in, but I first noticed it in my older ferrets, and then, in the rest of the ferrets. When I first started treating the ferrets, I just treated the ones who were sick. It would just not go away. Everytime I thought I had seen the last of it, someone else came down with it. Plus, the ferrets hated the taste of the Flagyl, so getting the medicine down was not easy. (I had one ferret that peed on me every single time I gave it to him <GRIN> ) I posted to the fml about it, and some wonderful person (sorry, I don't remember who) e-mailed me with what they had done to get rid of it, which worked. Basically, what I did was, I ordered specially prepared flagyl from a compounding pharmacy that was flavored. Among the 4 flavors I tried, banana, rasberry, chicken, and tuna, the best received one was rasberry. I then treated every ferret of my own and in the shelter twice a day for a month. I also shampooed the carpets, not only with regular carpet soap but also with a healthy portion of Odoban (an antibacterial virucide - available at Sam's Club), scrubbed out all of the cages, and completely emptied and cleaned the litterboxes twice a day. I also did not let the ferrets out of their cages for that month. I know they hated it, but I just couldn't take the chance of them pooping somewhere and me missing it, and then having them getting reinfected again. Thankfully, I had some wonderful shelter helpers who helped me out tremendously with this. I did this for a month, and it worked! I have not had giardia back since. The medicine probably cost me about $200 overall, but it was worth it, and that was for treating 30+ ferrets. I think the most important thing was the constant changing of the litter and disinfecting, and treating everyone twice a day. Its possible that for your Goose, he is just getting reinfected with it, which is why the medicine is not doing anything. Your other two pets (ferrets?) probably also have it, they are just not showing symptoms yet, and a stool sample must be very fresh to test, and even then does not always give a positive test, even when they have it. Also, be careful what you handle, giardia can be passed to humans. Just make sure you wash your hands everytime after handling your pets. Good luck with this, it is a nasty little protozoa to get rid of. Dooks and kisses to your fuzzies, Shelley Knudsen Pre-Veterinary Student UNK [log in to unmask] http://www.tcgcs.com/~ferrets 402-463-0190 402-461-6541 fax: 253-981-1054 "It is not what life throws at us, but what we do with it, that defines who we are." - Author unknown [Posted in FML issue 2997]