My pup at several months had giardia but it wasn't caught until a year later. I took her to 3 different vets and had 3 fecal samples done. All were negative for giardia. We went through a lot of crate cleaning and backyard cleaning with bleach. Finally I couldn't take it anymore and brought her to see a vet recommended through yelp and explained what was going on, swearing she had a GI bug that wasn't catchable. They suggested a more specific test for giardia and other GI bugs. It was more expensive but more reliable then the common fecal tests. And yes, there was the giardia in the results. Finally! Finally! The vet immediately started her on the right antibiotics and supplemented her with vitamins lost from all the months of diarrhea. I had to clean the yard with bleach solution every time she went, so she wouldn't reinfect herself. I don't trust any other vets now. And because she had giardia for such a long time, her whole GI system is messed up and she's been diagnosed with Crohn's disease. She is permanently on steroids and antibiotics now to control her inflammed GI system. She's currently 4yo now and stable for 2+ years now, with occasional flares. She's on a single protein diet of venison, no grains allowed. We've already tried chicken, beef, turkey, fish, duck, pork, and hydrolzed proteins. Long story short, make sure you have a good vet who will listen to you and dog insurance, and if need be a good internal medicine vet specialist.
Last edited by ashpaw; 01-05-2017 at 04:49 PM.