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How to diagnose and treat giardia in cats
Watch for changes in bowel movements.
If you want to diagnose giardia, pay attention to your cat's litter box. The main sign of giardia is unusual bowel movements.

Select from the following. 1). Ask your vet about how your cat might be acting. Also, make sure your cat avoids fluids entirely, like water.; 2). If you notice unusual or unusually movements in your cat, then you will need to visit the vet. Some cats may have a bowel bulge up to about two-inch (7.6-centimeter) long.; 3). Cats will have foul-smelling, watery diarrhea that may contain trace amounts of blood. Some cats may also lose weight with giardia due to the diarrhea.; 4). At first, mild stool will show up on the litter box. Then, if there is mild, moderate or severe diarrhea, a vet may notice leg or bowel problems.;
3).