Giardia Foster & Smith Reprint Giardiasis is very difficult to diagnose because the protozoa are so small and are not passed with every stool. Tests on serial stool samples (one stool sample every day for three days) are often required to find the organism.
Special diagnostic procedures, beyond a routine fecal examination, are necessary to identify Giardia. The procedures we use to identify roundworms and hookworms kill the active form of Giardia and concentrate the cyst form.
I would go to a different vet and ask for a Giardia test. When Nisha was diagnosed, she had already had 2 fecals done. We switched vets, and she suggested a Giardia test...which came up positive.
I too would put her back on the bland diet; the Hills stuff is crap, I was upset with my vet for even suggesting it! If you get tired of cooking (like I did), Wellness makes a formula that is very bland. It is called Simple Solutions, Nisha did great on it.